Unit Two Practice Test: Powers and Exponent Laws
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1 Class: Date: Unit Two Practice Test: Powers and Exponent Laws Multiple Choice Identify the choice that best completes the statement or answers the question 1 Write the base of ( 6) 5 a 6 b 6 c 6 5 d 5 Evaluate: 4 6 a 196 b 4096 c 10 d 4 3 Write one billion as a power of 10 a 10 9 b 10 8 c d Evaluate: ( 15) 0 a 1 b 1 c 0 d 15 5 Evaluate: (10 0 ) 7 a 7 b 1 c 7 d 1 6 State which operation you would do first to evaluate a Square 6 c Subtract 5 from 6 b Add 8 and 9 d Multiply 9 and 6 7 Evaluate: 5 3 ( 6) 3 a 33 b 91 c 341 d 3 8 Evaluate: ( + 3) (3 5) 3 a 17 b 85 c 16 d 33 9 Write the product of as a single power a 10 6 b 5 6 c 5 6 d 5 8 1
2 10 Write the quotient of 6 8 as a single power 4 6 a 6 4 b c 6 d Express ( 5) 6 ( 5) 6 as a single power ( 5) 4 a ( 5) 9 b ( 5) 8 c ( 5) 3 d ( 5) 3 1 Write È ÎÍ ( 4) ( 5) 5 as a product of powers a ( 4) 5 + ( 5) 5 c ( 4) 5 ( 5) 5 b d 5 ( 4) + 5 ( 5) 13 Write as a quotient of powers a b 3 c d È 14 Evaluate: ( 4) 0 5 ÎÍ a 5 b 5 c 1 d 1 15 Which answer is negative? i) ( 7) 10 ii) (7) 10 iii) ( 7) 10 a i only b i and iii c i and ii d ii and iii 16 Evaluate: 10 7 a b c d 70
3 17 Which is the correct value of ? i) 14 ii) 10 iii) 16 iv) 3 a ii b iii c i d iv 18 Evaluate: ( ) 4 ( ) ( ) 0 a 3 b 64 c 56 d Evaluate: a c 10 b d Write È ÎÍ ( 7) 5 as a product of powers a ( 7) 5 5 b ( 7) c ( 5) 5 d 5 ( 7) 1 Which expressions have positive values? i) È ( 7 ) 6 7 ÎÍ ii) È ( 7) 7 ÎÍ iii) È iv) ( 7) 7 ÎÍ a ii and iv b i and iv c i and ii d ii and iii Short Answer Write the base and the exponent of this power: ( 8) 4 3
4 3 Write using powers of 10 4 Evaluate: 4 [6 ( )] 3 5 Simplify, then evaluate ( ) 5 ( ) 7 ( ) 6 6 Simplify, then evaluate State which operation you would do first to evaluate (6) 0 + [8 ( )] 5 4
5 8 Insert brackets to make each statement true a) = 13 b) = 61 9 Simplify, then evaluate ( ) 4 ( ) ( ) 4 ( ) 0 È 30 Write ÎÍ 11 ( 1) 13 3 as a product of powers 31 Simplify, then evaluate
6 3 Simplify, then evaluate Problem 33 Evaluate: 5(3) 3 3( 5) 3 Show your steps 34 One estimate shows that the number of people without access to safe drinking water is about one billion How much water is required if each person who does not have access to safe drinking water is given 10 L of safe drinking water? Give your answer in standard form and using powers of 10 6
7 35 Evaluate: (10) (4) (6) () Show your calculations 36 Identify, then correct, any errors in the work shown = = 3 = 6 7
8 37 Identify, then correct, any errors in the work shown = 3 3 = 3 6 = 3 6+ = 3 8 = Where possible, replace with a + or sign to make each product positive a) ( 8) 11 b) ( 8) 1 c) ( 8) 1 d) ( 8) 11 Can all products be made positive? Explain 8
9 9 39 These are two samples of student work Are they correct? Explain Student A: = 3 1 = 3 14 Student B: = 3 7 = Simplify, then evaluate Show your work
10 Unit Two Practice Test: Powers and Exponent Laws Answer Section MULTIPLE CHOICE 1 ANS: B PTS: 1 DIF: Easy REF: 1 What Is a Power? LOC: 9N1 TOP: Number KEY: Conceptual Understanding ANS: B PTS: 1 DIF: Moderate REF: 1 What Is a Power? LOC: 9N1 TOP: Number KEY: Procedural Knowledge 3 ANS: A PTS: 1 DIF: Easy REF: Powers of Ten and the Zero Exponent LOC: 9N1 TOP: Number KEY: Procedural Knowledge 4 ANS: B PTS: 1 DIF: Easy REF: Powers of Ten and the Zero Exponent LOC: 9N1 TOP: Number KEY: Procedural Knowledge 5 ANS: D PTS: 1 DIF: Moderate REF: Powers of Ten and the Zero Exponent LOC: 9N1 TOP: Number KEY: Procedural Knowledge 6 ANS: A PTS: 1 DIF: Easy REF: 3 Order of Operations with Powers LOC: 9N1 TOP: Number KEY: Conceptual Understanding 7 ANS: C PTS: 1 DIF: Moderate REF: 3 Order of Operations with Powers LOC: 9N1 TOP: Number KEY: Procedural Knowledge 8 ANS: D PTS: 1 DIF: Moderate REF: 3 Order of Operations with Powers LOC: 9N1 TOP: Number KEY: Procedural Knowledge 9 ANS: B PTS: 1 DIF: Easy REF: 4 Exponent Laws I LOC: 9N TOP: Number KEY: Procedural Knowledge 10 ANS: A PTS: 1 DIF: Easy REF: 4 Exponent Laws I LOC: 9N TOP: Number KEY: Procedural Knowledge 11 ANS: B PTS: 1 DIF: Moderate REF: 4 Exponent Laws I LOC: 9N TOP: Number KEY: Procedural Knowledge 1 ANS: C PTS: 1 DIF: Easy REF: 5 Exponent Laws II LOC: 9N TOP: Number KEY: Procedural Knowledge 13 ANS: D PTS: 1 DIF: Easy REF: 5 Exponent Laws II LOC: 9N TOP: Number KEY: Procedural Knowledge 14 ANS: C PTS: 1 DIF: Moderate REF: 5 Exponent Laws II LOC: 9N TOP: Number KEY: Procedural Knowledge 15 ANS: D PTS: 1 DIF: Moderate REF: 1 What Is a Power? LOC: 9N1 TOP: Number KEY: Conceptual Understanding 16 ANS: B PTS: 1 DIF: Easy REF: Powers of Ten and the Zero Exponent LOC: 9N1 TOP: Number KEY: Procedural Knowledge 17 ANS: B PTS: 1 DIF: Moderate REF: 3 Order of Operations with Powers LOC: 9N1 TOP: Number KEY: Procedural Knowledge 1
11 18 ANS: B PTS: 1 DIF: Moderate REF: 4 Exponent Laws I LOC: 9N TOP: Number KEY: Procedural Knowledge 19 ANS: B PTS: 1 DIF: Moderate REF: 4 Exponent Laws I LOC: 9N TOP: Number KEY: Procedural Knowledge 0 ANS: A PTS: 1 DIF: Easy REF: 5 Exponent Laws II LOC: 9N TOP: Number KEY: Procedural Knowledge 1 ANS: B PTS: 1 DIF: Moderate REF: 5 Exponent Laws II LOC: 9N TOP: Number KEY: Conceptual Understanding SHORT ANSWER ANS: Base: 8 Exponent: 4 PTS: 1 DIF: Easy REF: 1 What Is a Power? LOC: 9N1 TOP: Number KEY: Conceptual Understanding 3 ANS: = ( ) + ( ) + ( ) + ( ) PTS: 1 DIF: Moderate REF: Powers of Ten and the Zero Exponent LOC: 9N1 TOP: Number KEY: Procedural Knowledge 4 ANS: 43 PTS: 1 DIF: Moderate REF: 3 Order of Operations with Powers LOC: 9N1 TOP: Number KEY: Procedural Knowledge 5 ANS: ( ) 6 = 64 PTS: 1 DIF: Moderate REF: 4 Exponent Laws I LOC: 9N TOP: Number KEY: Procedural Knowledge 6 ANS: 3 = 3 = 6 = PTS: 1 DIF: Moderate REF: 5 Exponent Laws II LOC: 9N TOP: Number KEY: Procedural Knowledge 7 ANS: Divide 8 by PTS: 1 DIF: Easy REF: 3 Order of Operations with Powers LOC: 9N1 TOP: Number KEY: Conceptual Understanding
12 8 ANS: a) (5 ) = 13 b) (3 + 4) 5 = 61 PTS: 1 DIF: Moderate REF: 3 Order of Operations with Powers LOC: 9N1 TOP: Number KEY: Problem-Solving Skills 9 ANS: ( ) = 4 PTS: 1 DIF: Moderate REF: 4 Exponent Laws I LOC: 9N TOP: Number KEY: Procedural Knowledge 30 ANS: 11 3 ( 1) 13 3 PTS: 1 DIF: Easy REF: 5 Exponent Laws II LOC: 9N TOP: Number KEY: Procedural Knowledge 31 ANS: = 0 16 = 4 = 16 PTS: 1 DIF: Moderate REF: 5 Exponent Laws II LOC: 9N TOP: Number KEY: Procedural Knowledge 3 ANS: = 4 3 = = 4080 PTS: 1 DIF: Moderate REF: 5 Exponent Laws II LOC: 9N TOP: Number KEY: Procedural Knowledge PROBLEM 33 ANS: 5(3) 3 3( 5) 3 = ( 15) = = 510 PTS: 1 DIF: Difficult REF: 1 What Is a Power? LOC: 9N1 TOP: Number KEY: Problem-Solving Skills 3
13 34 ANS: Each person is to be given 10 L of safe drinking water 1 billion 10 L = = = L L = L The amount of water required is about L, or L PTS: 1 DIF: Moderate REF: Powers of Ten and the Zero Exponent LOC: 9N1 TOP: Number KEY: Problem-Solving Skills Communication 35 ANS: (10) (4) = (6) () = 84 8 = PTS: 1 DIF: Moderate REF: 3 Order of Operations with Powers LOC: 9N1 TOP: Number KEY: Problem-Solving Skills Communication 36 ANS: Errors: The exponents should be added and subtracted, not multiplied and divided The result of 3 is 3 3, not 3 Correction: = = 3 1 = 3 PTS: 1 DIF: Difficult REF: 4 Exponent Laws I LOC: 9N TOP: Number KEY: Problem-Solving Skills Communication 4
14 37 ANS: Errors: In line 1, the exponents of 3 should be added instead of multiplied In line 3, the exponents of 3 should be multiplied instead of added Correction: = 3 +3 = 3 5 = 3 5 = 3 10 = PTS: 1 DIF: Moderate REF: 5 Exponent Laws II LOC: 9N TOP: Number KEY: Problem-Solving Skills Communication 38 ANS: a) Replace with a sign b) Replace with a + sign c) ( 8) 1 is always negative d) Replace with a sign Not all products can be made positive In part c, there is an even number of factors in the power ( 8) 1 ( 8) 1 is always positive, which means ( 8) 1 is always negative PTS: 1 DIF: Difficult REF: 1 What Is a Power? LOC: 9N1 TOP: Number KEY: Problem-Solving Skills Communication 39 ANS: Both final answers are correct but the method Student A used is wrong When two powers of 3, 3 3 and 3 4, are multiplied, the exponents 3 and 4 should be added When a power of 3, 3 1, is raised to the exponent, the exponents 1 and should be multiplied PTS: 1 DIF: Moderate REF: 5 Exponent Laws II LOC: 9N TOP: Number KEY: Communication 5
15 40 ANS: = = 10 (8+15) (10+1) = = = = PTS: 1 DIF: Difficult REF: 5 Exponent Laws II LOC: 9N TOP: Number KEY: Problem-Solving Skills 6
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