7th Grade Math

EP10 Extra Practice

Extra Practice

Multi-Part Lesson 3-4 (continued)

PART B PAGES 181–184

Write each expression using a positive exponent.

1. 4 · 4 · 4 · 4 2. ^34 · ^3
   4
   3. 7 · 7 · 7 · 7 · 7 · 7


2. 4 · 4 · 4 · 4 · 4 · 5 · 5 · 5 · 5 · 5 · 5 · 5 · 5 5. 3 · 2 · ^56 · 65 · ^56 · 2 · 2 · 2 · 3 · ^56


3. b · b · b · b · c · c · c · c · c · c 7. 3 · 2 · 5 · 5 · 5 · 2 · 2 · 2 · 3 · 5


4. a · a · a · b · b · b · a · a · a · b 9. 6 · 6 · 6 · 6 · 6 · 6 · 6 · 6

Write each fraction as an expression using a negative exponent other than -1.

10. ^1
    35
    11. ^1
    52
    12. 2431 13. ^19

PART C PAGES 185–189

Express each number in standard form.

1. 4.5 × 103 2. 2 × 104 3. 1.725896 × 106


2. 9.61 × 102 5. 1 × 107 6. 8.256 × 10^8


3. 3.25 × 102 8. 3.1 × 10 -^4 9. 2.51 × 10 -^2


4. 6 × 10 -^1 11. 2.15 × 10 -^3 12. 3.14 × 10 -^6
   Express each number in scientific notation.


5. 720 14. 7,560 15. 892


6. 1,400 17. 91,256 18. 51,000


7. 0.012 20. 0.0002 21. 0.054


8. 0.231 23. 0.0000056 24. 0.000123

Multi-Part Lesson 4-1: Addition and Subtraction Equations

PART A PAGES 202–203

Use the work backward strategy to solve each problem.

1. DVDS Jeffrey rented 2 times as many
   DVDs as Paloma last month. Paloma
   rented 4 fewer than Robbie, but 4 more
   than Sanjay. Robbie rented 9 DVDs. How
   many DVDs did each person rent?


2. NUMBERS A number is divided by 2.
   Then 4 is added to the quotient. Next,
   the sum of these numbers is multiplied
   by 3. The result is 21. Find the number.


3. FOOD After four days, 0.5 pound of
   lunch meat was left in the refrigerator.
   If half this amount was eaten on each
   of the previous four days, how much
   lunch meat was initially in the
   refrigerator?
   2. MONEY Holly spent $13.76 on a
   birthday present for her mom. She
   also spent $3.25 on a snack for herself.
   If she now has $7.74, how much money
   did she have initially?
   4. TIME A portion of a shuttle bus
   schedule is shown below. What is the
   earliest time after 9 a.m. when the
   bus departs?
   Departs Arrives
   8:55 A.M. 9:20 A.M.
   ? 10:08 A.M.
   10:31 A.M. 10:56 A.M.
   11:19 A.M. 11:44 A.M.

EP2_EP36_ExtPract_M1_895130.indd EP10 1/6/10 11:46 AM