Topic 4 Review

Powers of 10

100

63.7 X 10

637

200

94.6 X 10³

94,600

300

681.7 X 10⁴

6,817,000

400

0.629 X 10^_?_ = 62.9

10²

500

1.23 = 10^_?_ X 0.123

10¹

Estimation

100

Estimate the answer:

104 X 0.33

30

200

Estimate the answer: 

0.87 X 112

90

300

Estimate the answer: 

0.12 X 105

10

400

Estimate the answer: 

99.2 X 82

8,000

500

Estimate the answer: 

12 X 0.37

3.7 - 4

Decimal X Whole Number

100

4 X 0.27

1.08

200

1.35 X 5

6.75

300

0.35 X 3

1.05

400

40 X 0.22

8.8

500

2.54 X 12

30.48

Decimal X Decimal

100

0.5 X 0.7

0.35

200

2.4 X 0.7

1.68

300

0.2 X 0.8

0.16

400

11.1 X 0.8

8.88

500

15.7 X .62

9.734

Vocabulary

100

When estimating, doing this means you estimate a number lower than the actual answer.

Underestimate

200

When estimating, doing this means you estimate a number higher than the actual answer.

Overestimate

300

Numbers that are easy to compute with mentally are called... (We used to call them "Friendly Numbers.")

Compatible numbers

400

Products found by breaking one of two factors into ones, tens, hundreds, and so on, and then multiplying each of these by the other factor

Partial Products

500

The number that tells how many times a base number is used as a factor

Exponent