Unit 7 Test Review

Multiply by Powers of 10

100

0.8 x 100 =

8

200

2.75 x 1,000

2,750

300

0.98 x 10 =

9.8

400

91.3 x 0.1 =

9.13

500

8.5 x 0.01 =

0.085

Divide by Powers of 10

100

43 divide 10

4.3

200

62.5 divide 100

0.625

300

5.11 divide 0.1 =

51.1

400

87.2 divide 0.01 =

8,720

500

0.402 divide 0.1 =

4.02

Exponents

100

0.59 x 10¹=

5.9

200

82.4 x 10²= 

8,240

300

6.1 x 10⁴=

61,000

400

Which three choices  are the correct way to write 0.09 x 10⁵

a. 0.09 x (10 x 10 x 10 x 10 x 10)

b. 0.09 x 10 x 5

c. 0.09 x 10 x 50

d. 0.09 x 100,000

e. 900,000

f. 9,000

 

A, D, F

500

5,907 x 10²=

590,700

Division

100

216 divide 18 =

12

200

408 divide 17 =

24

300

1,215 divide 27

45

400

1,638 divide 21 =

78

500

3,276 divide 36 =

91

Dividing Fractions

100

1/5 divide 7 =

1/35

200

8 divide 1/4

32

300

1/6 divide 9 = 

1/54

400

If it takes 1/3 of a can of frosting to cover a small cake, how many small cakes can be made with 4 cans of frosting?

12 cakes

500

There was 1/4 of a carton of ice cream for Michelle and her two friends to share. If they split the ice cream evenly among them, how much of the original carton of ice cream did the 3 kids get?

1/12 of the ice cream

Random

100

Sky solved the problems below and got all the answers correct. Describe what is happening to the number of zeroes in these problems and explain why it works that way.

25 x 10¹ = 250      25 x 10²= 2,500     25 x 10³= 25,000

More zeroes are being added to each product. This happens because the exponent tells you how  many times to multiply ten. For example 10² is like saying 10 x 10 = 100 so 25 x 100 - 2,500

200

Cameron solved the problems below and got all the answers correct. Describe what is happening to the decimal point in these problems and explain why it works. 

386.7 divide 10 = 38.67 386.7 divide 100 = 3.857 386.7 divide 1,000 = 0.3867

When you divide by a whole number the quotient gets smaller. Also, when you divide by a power of 10, the decimal point moves to the right. Each power of 10 is one place value spot. 

300

854 divide 27 =

31 r 17

400

The 18 students in Ms. Crawford's class picked 660 strawberries at their field trip to a strawberry patch. If they share them equally, how many strawberries can each student have? Explain what you did with the remainder, if any, and why.

36 strawberries, 12 remaining strawberries 

500

Ramon has 3,974 baseball cards. He wants to put them in collector sheets that hold 32 cards per sheet. How many sheets does Ramon need for entire collection? Explain what you did with the remainder, if any, and why.

124 r 6, so he would need 125 sheets