# Integers (pages )

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1 A Integers (pages ) An integer is any number from this set of the whole numbers and their opposites: { 3, 2,, 0,, 2, 3, }. Integers that are greater than zero are positive integers. You can write positive integers with or without a sign. Writing and Integers that are less than zero are negative integers. You write negative Graphing integers with a sign. Integers Zero is the only integer that is neither positive nor negative. Each integer has an opposite that is the same distance from zero but in the opposite direction on the number line. Recall that 7 3 means 7 is greater than 7 3 means that 7 is Comparing less than Integers To order integers, first graph them on a number line. Then write them in order from left to right, or least to greatest. A Graph 5 and its opposite on a number line A number line always has arrows on both ends, with zero and at least one other number marked to show the size of a unit. Make a dot to show the integers you are graphing. Which is greater, 7 or 3? Think of both of these on a number line. Which integer is to the left? A number to the left is always less than the number to the right. 7 3 or 3 7. Order from least to greatest: 2. Write an integer to represent a debt 2, 2, 5, 5, 0. of \$9. Draw a number line from 0 to 0. Graph each integer on the number line Replace each with,, or to make a true sentence Order 5, 6, 9, and from least to greatest. 2. Standardized Test Practice Which integer is the opposite of 25? A C 5 D 5 Answers:. 5, 2, 0, 2, 5 2. \$ See Answer Key , 5,, Mathematics: Applications and Concepts, Course

2 A Adding Integers (pages ) You can use a number line to add integers. Adding Integers To find the sum of 5 ( 7), follow these steps. Start at zero on the number line. Go 5 in the positive direction (right). From that point, go 7 in the negative direction (left). The point where you end ( 2) is the sum. A Is this sum positive, negative, or zero? 3 5 Which integer is farther from zero? 5. The sum will have the same sign as the integer that is farther from zero. The sum of 3 5 is positive. Find the sum of 4 ( 3). Start at zero on the number line. Go 4 in the negative direction. From that point, go 3 more in the negative direction. You end at the point The sum of 4 ( 3) is. Is 8 ( 0) positive, negative, or zero? 2. Find the sum of 2 HINT: Which integer is farther from zero? HINT: Use a number line. Tell whether each sum is positive, negative, or zero without adding ( 0) 5. 8 ( 2) 6. 3 ( 3) 5 4 ( 4) 9. 5 ( 3) 0. 6 ( 6) Add ( 5) 4 ( 3) ( 5) 6. 2 ( 2) ( 4) 9. What is 2 plus 4 plus 3? 20. Find the sum of 4 and Football In a football game, team A was on the 50 yard line. Then they lost 7 yards on the next play. What yard line are they on now? 22. Standardized Test Practice What is the sum of 8, 4, and 2? A 6 8 C 4 D 2 Answers:. negative 2. positive negative 5. negative 6. negative positive negative 9. positive 0. zero yard line 22. A 55 Mathematics: Applications and Concepts, Course

3 A Subtracting Integers (pages ) You can use counters or a number line to subtract integers. Subtracting Integers To find the difference 4 ( 7), follow these steps. Place 4 positive counters on a mat. To subtract 7, you must remove 7 negative counters. To be able to do this, first add 7 zero pairs to the mat. Remove 7 negative counters. There are positive counters remaining on the mat. 4 ( 7) A Find 3 ( 4). Find 6 egin with 3 negative counters. Add a zero pair Start at zero on the number line and go to 6. to the mat, then remove 4 negative counters. From there go 8 in the negative direction There is positive counter remaining. (left). You end at 2. 3 ( 4) Find 6 ( 9). 2. Find 9 HINT: egin with 6 positive counters, then add 9 zero pairs. HINT: Start at zero and go 9 in the negative direction. From there, go 3 more in the negative direction. Subtract. Use counters or a number line ( 5) 3 ( 3) ( 2) 2. 4 ( ) 8 ( 3) Find 3 2 ( 6). 6. Find the value of x y if x 7 and y Landscaping Charlie is a landscaper. He planted a row of flowers 2 feet back from the street. He then planted a row of bushes 4 feet behind the flowers. What negative integer represents how far back from the street the row of bushes is? Standardized Test Practice What is the difference 5 ( 5)? A 0 20 C 0 D 20 Answers: A 56 Mathematics: Applications and Concepts, Course

4 A Multiplying Integers (pages 30 33) Remember that multiplication is repeated addition. You can multiply integers by using counters or by using a number line to show repeated addition. Multiplying Integers 4 ( 3) means to put 4 sets of 3 negative counters on a mat. Then count the counters. There are 2 negative counters, so 4 ( 3) 2. 4 ( 3) means to remove 4 sets of 3 negative counters. To be able to do this, you must first place 4 sets of 3 zero pairs on the mat. Then remove the 4 sets of 3 negative counters. There are 2 positive counters remaining on the mat, so 4 ( 3) 2. A Find 3 5. Find 2( ). 3 5 means to remove 3 sets of 5 positive You can also use a number line. egin at counters. egin with 3 sets of 5 zero pairs on zero. Move units to the left, then more a mat. Then remove the 3 sets of 5 positive units to the left. You end at 22, so counters. There are 5 negative counters 2( ) 22. remaining, so What is the product of 4 and 8? 2. Find the product of 6 and 2. HINT: egin with 4 sets of 8 zero pairs. Then remove the 4 sets of 8 negative counters. HINT: egin at zero on a number line. Move 2 units to the left 6 times. Multiply. ( ) ( 3) ( 4) 3 ( 7) 9. 5 ( 3) ( 4) 2. 0( 3) 7( 5) 8( 9) 5. Solve 2( 3) a. 6. What is the product of 8 and 2? Time In winter, the days get shorter until December 2st. If each day is 2 minutes shorter than the day before, how many minutes will be lost in 5 days? Standardized Test Practice Find the product of 7 and A 3 C 28 D 2 Answers: minutes C 57 Mathematics: Applications and Concepts, Course

5 A Dividing Integers (pages 36 39) You can model dividing integers with counters or you can use a pattern. When you divide two positive integers, or two negative integers, the Dividing quotient is positive. Integers When you divide a negative integer and a positive integer, the quotient is negative. A Find 5 ( 3). The signs are the same. The quotient is positive. 5 ( 3) 5 Find 6 ( 2). The signs are different. The quotient is negative. 6 ( 2) 3. Find 2 2. Find 20 ( 5). HINT: If you divide 2 negative counters HINT: Do the two integers have the same sign into 3 groups, how many negative counters or different signs? are in each group? Divide ( 3) ( 7) 2 ( 3) ( 6) 0. ( ) ( 3) ( ) 5. Find the value of Divide 42 by Stock Market Mr. Jimenez lost \$320 in 4 days in the stock market. How much money did he lose each day? Plumbing The Chens kitchen faucet has a leak. It drips 3 quarts of water every day. How many quarts of water does it drip in one week? 9. Standardized Test Practice What is 8 divided by 9? A 8 8 C 9 D 9 Answers: \$80 2 quarts 9. C 58 Mathematics: Applications and Concepts, Course

7 Chapter 8 Review Up-and-Down Scavenger Hunt You ve entered a haunted house with your friends. The only way you can get out is to find the key to give to the doorkeeper. The key is located under a board on one of the steps on the staircase. You must use your knowledge of integers to find the step where the key is located. All positive integers indicate the number of steps you go up, and negative integers indicate the number of steps you go down.. Starting at the bottom of the staircase, go up 5 steps. Then go 3 steps. On which step are you located? 2. From your present location, go to the step that is 3 times the value of your current step. On which step are you now? Subtract steps from your location and go to the corresponding step. Where are you now? First go up one step and then divide the step you are on by 3 to find the number of steps you take next. On which step did you end up? 5. Add 8 steps to your present location and go to the corresponding step. Then multiply the step you are on by The product is the step under which the key is hidden. Which step is it? Answers are located on p Mathematics: Applications and Concepts, Course

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