# GRADE 4 SUPPLEMENT. Set B1 Algebra: Equations & Operations. Includes. Skills & Concepts

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1 GRADE 4 SUPPLEMENT Set B1 Algebra: Equations & Operations Includes Activity 1: Bowling for Equations B1.1 Activity 2: Order of Operations B1.6 Activity 3: Variables & Expressions B1.13 Activity 4: Writing & Solving Equations B1.21 Independent Worksheet 1: Bowling for Equations B1.31 Independent Worksheet 2: Expressions, Variables & Situations B1.33 Independent Worksheet 3: Solving & Writing Equations B1.35 Skills & Concepts H write and solve equations with (=) to show equivalence and use variables to express mathematical relationships involving multiplication and division H model, explain, and solve open number sentences involving addition, subtraction, multiplication, and division H use real-world situations involving multiplication or division to represent number sentences H use number sense, properties of multiplication, and the relationship between multiplication and division to find values for the unknowns that make the number sentences true H recognize that a symbol represents the same number throughout an equation or expression (e.g., + = 8; thus, = 4) H use the order of operations to evaluate, simplify, and compare mathematical expressions involving the four operations, parentheses, and the symbols <, >, and = P0310b

2 Bridges in Mathematics Grade 4 Supplement Set B1 Algebra: Equations & Operations The Math Learning Center, PO Box 12929, Salem, Oregon Tel by The Math Learning Center All rights reserved. Prepared for publication on Macintosh Desktop Publishing system. Printed in the United States of America. P0310b The Math Learning Center grants permission to classroom teachers to reproduce blackline masters in appropriate quantities for their classroom use. Bridges in Mathematics is a standards-based K 5 curriculum that provides a unique blend of concept development and skills practice in the context of problem solving. It incorporates the Number Corner, a collection of daily skill-building activities for students. References: Mathematical Sciences Education Board, National Research Council, Measuring Up: Prototypes for Mathematics Assessment, 1993 Shoecraft, Paul J. (April, 1982). Bowl-a-Fact: A game for reviewing the number facts, Arithmetic Teacher The Math Learning Center is a nonprofit organization serving the education community. Our mission is to inspire and enable individuals to discover and develop their mathematical confidence and ability. We offer innovative and standards-based professional development, curriculum, materials, and resources to support learning and teaching. To find out more, visit us at

3 Set B1 H Activity 1 ACTIVITY Bowling for Equations Overview The teacher introduces Roll-a-Fact, a game that provides opportunities to write and solve equations, as well as contexts for learning about the conventions of order of operations. To play the game, teams take turns to roll three dice (numbered 1 6) and make as many numbers from 1 to 10 as possible by adding, subtracting, multiplying, or dividing the numbers showing on the dice. Skills & Concepts H write and solve equations with (=) to show equivalence H model, explain, and solve open number sentences involving addition, subtraction, multiplication, and division H use the order of operations to evaluate, simplify, and compare mathematical expressions involving the four operations, parentheses, and the symbols <, >, and = You ll need H The Roll-A-Fact Game (page B1.5, run one copy on a transparency) H 3 dice (numbered 1 6) for each group of 4 students H Student Math Journals or notebook paper H helper jar containing a popsicle stick for each child with his/her name on it H a timer Advance Preparation Draw 10 circles on the board and number them from 1 10 as shown below Instructions for Bowling for Equations 1. Ask students if any of them have ever gone bowling. If so, what do they know about the game? After a few volunteers have shared, explain that in bowling, the objective is to knock down 10 pins with one or two rolls of a bowling ball. If you knock down all 10 pins with one roll, it s called a strike. If you knock them all down with two rolls, it s called a spare. 2. Now explain that you are going to play a new game called Roll-a-Fact today. This game is similar to bowling, except instead of rolling a ball, the class will roll 3 dice and knock down numbered pins by adding, subtracting, multiplying or dividing the numbers rolled to make 1 through 10. Each number rolled must be used exactly once on one side of an equation. 3. Work through an example together so students understand how to play the game. Draw their attention to the bowling pins you have drawn on the board. Rather than rolling the dice, ask students to pretend that the numbers that came up were 3, 4, and 6. Write these numbers on the board. Then work with input from the class to knock over the 7 pin by devising an equation that uses 3, 4, and 6 to make 7. Accept ideas for knocking over other pins as well during this initial discussion. Bridges in Mathematics Grade 4 Supplement B1.1

5 Bowling for Equations (cont.) 6. Record any additional ideas that have come out of the discussion. When there is general agreement that only pins 1, 2, 3, 5, 6, and 8 can be knocked down with a roll of 3, 4, 6, remind students that they can still get a spare if they can knock down the rest of the pins with a second roll. Ask them to pretend that the second roll was 3, 3, and 4. Write these numbers on the board, and give students a minute to work. Record their ideas on the board. Roll 1: 3, 4, 6 Roll 2: 3, 3, = x 6 3 = 8 3 x 4 6 = = 1 5 = = 3 x (4 3) = 5 6 (4 3) = 6 9 = 4 x = 10 4 x (3 3) = (3 3) = 4 4 (3 3) = 4 SPARE! 7. Now display the Roll-A-Fact Game sheet and review the rules at the top together. Explain that you will play as Team 1, while the students work together as Team 2. Let them know that after both teams have rolled, you will set the timer for 3 minutes. When it rings, you and the students will take turns writing equations on the game sheet. Tell them that you will choose names out of the helper jar to share, so everyone will need to be prepared. Give them a choice of working alone or in pairs, and ask them to record their work in their journal or on the backside of the paper they have been using. 8. Roll the dice and record your numbers on the game sheet. Call on a student to do the same for the class. Set your timer for 3 minutes and go to work as students do the same. When the timer sounds, record one of your equations and cross out the pin you just knocked down. Then pull a name from the helper jar and ask that student to come up, record an equation for the class, and cross out the corresponding pin. Take turns back and forth. When you enter your equations, reinforce the fact that we generally work from left to right, but we can use parentheses to show that we need to do something else first. Set B1 Algebra: Equations & Operations Blackline Run 1 copy on a transparency Roll-A-Fact Game Rules: Roll 3 dice numbered 1 6. Record the numbers you get. Add, subtract, multiply, or divide the 3 numbers to make as many numbers from 1 10 as possible. You must use all 3 numbers exactly once on one side of each equation. Strike beats a spare. If neither team gets a strike or a spare, the team that knocks down the most pins wins. Team 1 1st Roll:,, 2nd Roll:,, Team 2 1st Roll:,, 2nd Roll:,, (4 3) = = 9 4 x 2 3 = 5 10 = 3 x = 4 x 3 2 (4 3) x 2 = x 5 6 = 4 6 x 2 5 = 7 5 (6 2) = 1 6 (5 2) = = 9 10 Remember: We solve equations from left to right. Use parentheses if you need to. do something else first. Bridges in Mathematics Grade 4 Supplement B1.3

7 Blackline Run 1 copy on a transparency. Roll-A-Fact Game Rules: Roll 3 dice numbered 1 6. Record the numbers you get. Add, subtract, multiply, or divide the 3 numbers to make as many numbers from 1 10 as possible. You must use all 3 numbers exactly once on one side of each equation. Strike beats a spare. If neither team gets a strike or a spare, the team that knocks down the most pins wins. Team 1 1st Roll:,, 2nd Roll:,, Team 2 1st Roll:,, 2nd Roll:,, Bridges in Mathematics Grade 4 Supplement B1.5

10 Order of Operations (cont.) Students I said true because, look, 1 6 is 6. Then divide by 2, and it makes 3. I did 6 2 first because the rules say you have to do it that way. So 6 2 is 3 and then 1 3 is 3. But it says multiplication and division come first, so I said true because if you just do everything straight along, it makes Reveal each of the other 4 equations one by one, and work through each with the class as described in step 4. Here are the answers for your reference: = 2 False Fix: 6 (2 + 1) = = 4 True = 8 True = 10 False Fix: (6 1) 2 = Now show the last part of the display master. Read the problem with the class, and clarify as needed. 4 On his second roll, Teo got 2, 3, and. Solve the equations below to figure out the third number Teo rolled. a = 7 b ( + 3) 2 = 10 c 3 2 = 3 Ask the students to work the 3 equations privately on their paper or whiteboard. After about a minute, have them share with the people sitting nearest them. Then ask the class to report the answer. What was the third number Teo rolled? If there is more than one answer, record all responses. Then work through the equations one by one with input from the students. As they will discover, the unknown number is 2 each time. Why is that? Students Because it works for every problem. It has to be the same number because it s the last number he got when he rolled the 3 dice to play the game. There s a little box in every problem. That kind of gives you a hint that they re all going to be the same. Teacher But there are lots of times you ve filled in boxes to solve problems, and the numbers have been different. Why are they all the same this time? Students Because that s what works! Because all the answers are 2. They have to be. All of the equations he can make have to be with the same numbers. 7. Give students each a copy of Operations & Equations. Review the sheet with the class. When students understand what to do, have them go to work. Consider giving them the choice of working alone or with a partner. Circulate to provide help as needed, or pull a small group of students who may need extra support. B1.8 Bridges in Mathematics Grade 4 Supplement

11 Order of Operations (cont.) Set B1 Algebra: Equations & Operations Blackline Run a class set. Operations & Equations 1 Shanti is playing a game of Roll-a-Fact with her friend, Kendra. On her first roll, Shanti got 4, 3, and 5. Below are some of the equations she wrote. Read each and decide if it is true or false according to the order of operations. If an equation is false, rewrite it on the line so it is true. ex = 5 T or F (4 3) x 5 = 5 Order of operations a = 7 T or F b = 8 T or F c = 6 T or F d = 3 T or F e (5 + 3) 4 = 2 T or F 1. Do anything inside parentheses first. 2. Multiply or divide in order, left to right. 3. Add or subtract in order, left to right. 2 Kendra got 5, 3, and on her first roll. Solve the equations below to figure out the third number Kendra rolled. a (5 ) 3 = 10 b = c = 7 d 5 3 = e 2 3 Kendra rolled 5, 3, and. 1 3 Use Kendra s 3 numbers to knock over the 2, 3, and 4 pins. Write your equations on the lines below. Cross out the pins. a 2 = b 3 = c 4 = CHALLENGE 4 Can Kendra get a strike with her first roll? If not, roll 3 dice numbered 1 6. Record the numbers below. Can you use these numbers to knock over the rest of the pins? Write your equations on the back of this sheet. I got, and 8. As students finish, have them check their work with at least one classmate. Challenge them to resolve any differences in their responses by reworking the problem(s) together or consulting with others in the room. When they are finished, have them play Roll-a-Fact in pairs or groups of 4 (2 against 2). You may want to post the Roll-a-Fact display master at this point to remind students of the game rules. Have them draw and number the pins, and record their rolls and equations, in their journal or on a piece of notebook paper. Extensions Invite students to make up their own mystery roll problems for classmates to solve, similar to problem 2 on the Operations & Equations blackline. To do this, a student needs to roll 3 dice and write 3 or 4 equations to make any of the numbers Then he/she can write out the mystery set on a strip of paper for a classmate to solve. Jon M. 4 x 3 5 = 7 (3 + 5) 4 = 2 5 x (4 3) = = Roll: 4, 3, and 5 Mystery Roll by Jon M. 4 x 5 = 7 ( + 5) 4 = 2 5 x (4 ) = 5 What was my third roll? Bridges in Mathematics Grade 4 Supplement B1.9

12 Order of Operations (cont.) INDEPENDENT WORKSHEET Use Set B1 Independent Worksheet 1 to provide students with more practice solving equations using order of operations. B1.10 Bridges in Mathematics Grade 4 Supplement

13 Blackline Run 1 copy on a transparency. Introducing Order of Operations Samuel is playing a game of Roll-a-Fact with his friend, Teo. On his first roll, Teo got 6, 4, and 2. He said, I see how to knock down the 5 pin! He wrote this equation: = 5 Samuel said, I respectfully disagree with you, Teo. I think the answer to that equation is 8, see? 1 How did each boy get his answer? = 8 Order of operations is a set of rules for solving equations. People use this set of rules so everyone will get the same answer. 1. Do anything inside parentheses first. 2. Multiply or divide in order, left to right. 3. Add or subtract in order, left to right. 2 Which boy had the correct answer? Can you fix the incorrect equation so that it works? 3 Samuel got 2, 1, and 6 on his first roll. Here are some of the equations he wrote. Read each and decide if it is true or false. If it is false, see if you can fix it. a = 3 T or F b = 2 T or F c = 4 T or F d = 8 T or F e = 10 T or F 4 On his second roll, Teo got 2, 3, and. Solve the equations below to figure out the third number Teo rolled. a = 7 b ( + 3) 2 = 10 c 3 2 = 3 Bridges in Mathematics Grade 4 Supplement B1.11

14 Blackline Run a class set. Operations & Equations 1 Shanti is playing a game of Roll-a-Fact with her friend, Kendra. On her first roll, Shanti got 4, 3, and 5. Below are some of the equations she wrote. Read each and decide if it is true or false according to the order of operations. If an equation is false, rewrite it on the line so it is true. ex = 5 T or F (4 3) x 5 = 5 Order of operations a = 7 T or F b = 8 T or F c = 6 T or F d = 3 T or F e (5 + 3) 4 = 2 T or F 1. Do anything inside parentheses first. 2. Multiply or divide in order, left to right. 3. Add or subtract in order, left to right. 2 Kendra got 5, 3, and on her first roll. Solve the equations below to figure out the third number Kendra rolled. a (5 ) 3 = 10 b = c = 7 d 5 3 = e Kendra rolled 5, 3, and. 3 Use Kendra s 3 numbers to knock over the 2, 3, and 4 pins. Write your equations on the lines below. Cross out the pins. a 2 = b 3 = c 4 = CHALLENGE 4 Can Kendra get a strike with her first roll? If not, roll 3 dice numbered 1 6. Record the numbers below. Can you use these numbers to knock over the rest of the pins? Write your equations on the back of this sheet. I got, and B1.12 Bridges in Mathematics Grade 4 Supplement

16 Variables & Expressions (cont.) 2. Illustrate this idea by placing a collection of base ten pieces on display: 3 strips and 6 units. Ask students to describe what they see. Record each expression as it is volunteered. Teacher Please raise your hand if you have a way to describe this collection of base ten pieces. I ll write your ideas up here on the board. Students It s 36. It s 3 tens and 6 ones, or you could go You could write Teacher Okay, any other ideas? What are some other ways to describe this collection? Students You could do I know! It s 36 so you could say would work too. 3. Let students know that each of the descriptions they have offered is a mathematical expression a very short way to describe an amount. Now hold up one of the bags of base ten units, but do not tell students how many are in the bag. What expression might they use to describe the quantity in the bag? Students But we don t know how many are in there! There s no way we can tell about how many if we don t know the number. Let s count them! Teacher When we don t know what the number is, we can use a letter to represent the quantity instead. How about if we use the letter b to stand for the bag of units? 4. Hold up the quantities of base ten pieces listed below and work with students to devise an expression for each. Record the expressions on the board. 1 bag of base ten units and 3 extra units 2 bags of base ten units (assure students that each bag contains exactly the same number of units) 3 bags of base ten units and 5 extra units Expression 36 3 x x Bag of units b b x b or 2b 3b + 5 An expression is a very short way to describe an amount. B1.14 Bridges in Mathematics Grade 4 Supplement

17 Variables & Expressions (cont.) 5. Ask students to get out their math journals or notebook paper as you place Variables & Expressions on display with just the top section showing. Reveal the text one line or section at a time as you read and discuss it with the class. Set B1 Algebra: Equations & Operations Blackline Run 1 copy on a transparency Variables & Expressions In mathematics, an expression names an amount. Sometimes, an expression is a number, like 14. Sometimes, an expression is a variable, like n or x or. Sometimes an expression includes numbers, operations, and/or variables. example James got a small bag of fish crackers in his lunch today. He gave 6 of the crackers to his friend. We can use the expression c 6 to show how many crackers James had left. (We use the letter c to stand for the number of crackers because we don t know how many crackers are in the bag.) 1 Write an expression to represent each of these situations: Situation a Ashley had a full bag of fish crackers. Her sister gave her 3 more fish crackers. b Jason had a full bag of fish crackers. He gave 4 of them to his little brother. c There are 5 little bags of fish crackers in the cupboard. Each bag has exactly the same number of crackers. d Haley got a little bag of fish crackers in her lunchbox. She poured out the crackers and divided them evenly with her friend. Expression 2 There are exactly 42 fish crackers in every bag. Use that information to evaluate each expression above and find the answer. example James had c 6 crackers. Now we know c = 42, so we can write: 42 6 = 36 crackers, James had 36 crackers left. Have students record a response in their journal to each problem as it is displayed. Then call on volunteers to share and explain their thinking. Teacher Who would like to share the expression they wrote for our first situation. Jeffrey? Jeffrey The girl has 1 bag of crackers and 3 more, so I wrote c + 3 for that one. 6. When you have worked through the sheet together, give students each a copy of More Variables & Expressions. Review both sheets with the class. When students understand what to do, have them go to work individually or in pairs. Circulate to provide help as needed, or pull a small group to provide extra support. Bridges in Mathematics Grade 4 Supplement B1.15

19 Blackline Run 1 copy on a transparency. Variables & Expressions In mathematics, an expression names an amount. Sometimes, an expression is a number, like 14. Sometimes, an expression is a variable, like n or x or. Sometimes an expression includes numbers, operations, and/or variables. example James got a small bag of fish crackers in his lunch today. He gave 6 of the crackers to his friend. We can use the expression c 6 to show how many crackers James had left. (We use the letter c to stand for the number of crackers because we don t know how many crackers are in the bag.) 1 Write an expression to represent each of these situations: Situation a Ashley had a full bag of fish crackers. Her sister gave her 3 more fish crackers. b Jason had a full bag of fish crackers. He gave 4 of them to his little brother. c There are 5 little bags of fish crackers in the cupboard. Each bag has exactly the same number of crackers. d Haley got a little bag of fish crackers in her lunchbox. She poured out the crackers and divided them evenly with her friend. Expression 2 There are exactly 42 fish crackers in every bag. Use that information to evaluate each expression above and find the answer. example James had c 6 crackers. Now we know c = 42, so we can write: 42 6 = 36 crackers, James had 36 crackers left. Bridges in Mathematics Grade 4 Supplement B1.17

20 Blackline Run a class set. More Variables & Expressions page 1 of 2 1 One of the prizes kids can win at the school carnival is a bag of stickers. Each bag has exactly the same number of stickers. Draw a line from each of the situations to the matching expression. Situation ex Alicia won a bag of stickers. Her friend gave Alicia 6 more stickers. Expression 4 b or 4b a Corey won 4 bags of stickers. b + 6 b Neena won a bag of stickers. There was a hole in the bag and she lost 9 of the stickers. c Andre won a bag of stickers. When he got home, he divided the bag of stickers evenly among his 3 cousins. d Raven won 2 bags of stickers. Her friend gave her 12 more stickers. 2b + 12 b 9 b 3 2 There are exactly 27 stickers in every bag. Use that information to evaluate each expression above and find the answer. example Alicia had b + 6 stickers. Now we know b = 27, so we can write = 33 stickers, Alicia had 33 stickers in all. a b c d Corey won stickers in all. Neena had stickers left. Each of Andre s cousins got stickers. Raven had stickers in all. 3 Tyrone won 3 bags of stickers. He lost 15 of the stickers on the way home. Which expression shows how many stickers Tyrone had when he got home? 3b b 3b 15 b 15 4 Evaluate the expression you just chose. Exactly how many stickers did Tyron have when he got home? Show your work. B1.18 Bridges in Mathematics Grade 4 Supplement

21 Blackline Run a class set. More Variables & Expressions page 2 of 2 5 To evaluate an expression, you have to replace the variable with a number so you can find the answer. Evaluate each of the expressions below. Expression Evaluate if x = 12 Evaluate if x = 60 Evaluate if x = 120 ex x = = = 125 a 4x b x 8 c x 3 d 3x + 5 e (x 2) Write a situation to match each of the expressions below. The variable b stands for bag, but you can choose whatever you want to put in the bag. Expression ex b 3 Situation I got a bag of carrots. I gave 3 of the carrots to my friend, Max. a 25 + b b 2b c b 2 d b + 43 CHALLENGE e 3b 10 f (6b 2) + 4 g (18b 3) 12 Bridges in Mathematics Grade 4 Supplement B1.19

22 B1.20 Bridges in Mathematics Grade 4 Supplement

23 Set B1 H Activity 4 ACTIVITY Writing & Solving Equations Overview Students determine whether pairs of expressions are equal. Then they practice solving equations and writing and solving equations to go with story situations. Finally, they play a new game in which they solve a series of equations. Skills & Concepts H write and solve equations with (=) to show equivalence H use real-world situations involving multiplication or division to represent number sentences H use number sense, properties of multiplication, and the relationship between multiplication and division to find values for the unknowns that make the number sentences true H model, explain, and evaluate expressions involving addition, subtraction, multiplication, and division H use the order of operations to evaluate, simplify, and compare mathematical expressions involving the four operations, parentheses, and the symbols <, >, and = H recognize that a symbol represents the same number throughout an equation or expression (e.g., + = 8; thus, = 4) You ll need H Writing & Solving Equations (page B1.26, run one copy on a transparency) H Algebra Puzzles, Games 1 & 2 (pages B1.27 & B1.28, see Advance Preparation) H Algebra Puzzles Record Sheet (page B1.29, run a class set) H overhead spinner overlay H red and blue overhead pens H 3 3 sticky notes (see Advance Preparation) H blue and red colored pencils for each student H a piece of paper to mask portions of the display master H Student Math Journals or notebook paper Advance Preparation Run 1 copy each of pages B1.27 and B1.28 on a transparency. Cover each puzzle on both sheets with a sticky note trimmed to 3 1 so students will be able to focus more effectively on each set as it is presented. Do not cover the row of shapes at the bottom of each puzzle. 1. A + 15 = A = 24 A B = 3 A + B = 26 (A + B) x C = 200 (B A) C = 2 = = = = = = 3. 3A = A = 65 B A = 5 A B = 5 A + C x B = 105 (A B) C = 7 = = = = = = Instructions for Writing & Solving Equations 1. Let students know that they will be writing and solving equations today, as well as learning to play a new game. Ask them to get out their math journals or a piece of notebook paper as you place Writing and Solving Equations on display with all but the top section covered. Bridges in Mathematics Grade 4 Supplement B1.21

24 Writing & Solving Equations (cont.) Set B1 Algebra: Equations & Operations Blackline Run 1 copy on a transparency Writing & Solving Equations An equation is a mathematical sentence we use to show that two expressions are equal. Look at the examples below. For each equation, identify the two expressions, and decide whether or not they are equal. Remember to use order of operations. examples = = = = Read the text at the top of the sheet with the class, and have them copy the first equation. Explain that there are two expressions, one on either side of the equals sign. What are they? Are they actually equal? Students The first expression is 2 + 5, but there s only a 7 on the other side. But remember? An expression can be just a number, so the 7 is the other expression definitely equals Repeat this process with each of the other equations at the top of the sheet. As students copy each, ask them to circle the two expressions and determine whether or not they are equal. The third equation will present an opportunity to discuss order of operations and to introduce the inequality sign. Students On that third one, I don t think it s equal on both sides. Yes it is! is 7, then multiply 7 5, and you get 35. But remember? You have to do multiplication and division first, so it s really 6 5 is 30, then add 1. The real answer is 31, not 35. We could put parentheses around the Then it would be right. Teacher If we leave the two expressions exactly the way they are now, are they equal? Jasmin No! You have to follow the rules, so the answer is 31, not 35. Teacher Mathematicians actually have a symbol to show that two expressions are not equal. It is called an inequality sign, and it looks like this:. DJ Cool! It s just an equals sign with a slash through it! Jarod 4/ = 7 3 x 6 = expressions x = 3 x Reveal the next section of the display master. Read it with the class, and then ask the students to copy and solve each of the three equations. To solve an equation, find the value of the variable that will make both expressions equal. 1 Solve each of the equations below: 4 + r = 14 r = How did you solve it? 125 m = 5 m = How did you solve it? z 6 = 600 z = How did you solve it? B1.22 Bridges in Mathematics Grade 4 Supplement

27 Writing & Solving Equations (cont.) Algebra Puzzles, Game 2 Solutions Puzzle 1: Circle = 12, Square = 27, Pentagon = 10 Puzzle 2: Circle = 7, Square = 4, Pentagon = 30 Puzzle 3: Circle = 40, Square = 8, Pentagon = 7 Puzzle 4: Circle = 4, Square = 18, Pentagon = 2 Invite interested students to make their own algebra puzzles for classmates to solve. INDEPENDENT WORKSHEET Use Set B1 Independent Worksheet 3 to provide students with more practice writing and solving equations. Bridges in Mathematics Grade 4 Supplement B1.25

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