Topic 2

Subract Decimals

100

7.96-0.65=

7.31

200

2.90-1.25=

1.65

300

8.2-4.65=

3.55

400

11.06-1.84=

9.22

500

108.15-5.50=

102.65

Add Decimals

100

7.06+0.85=

7.91

200

0.82+4.21=

5.03

300

9.1+7.21=

16.31

400

4.98+3.02=

8

500

0.26+8.3+4.2=

12.76

Estimate Sums

100

Estimate the sum

49+22.88

~72

200

Estimate the sum

576+94.6

~700

300

Estimate the sum

179+277.1

~500

400

Estimate the sum

345.1+237.5

~500

500

Estimate the sum

837+488.12

~1,300

Estimate Differences

100

Estimate the difference

86.9-18

~69

200

Estimate the difference

23.2-9.71

~13

300

Estimate the difference

38.9-21.4

~20

400

Estimate the difference

788.9-572

~200

500

Estimate the differene

345.1-237.5

~110

Vocabulary

100

The property of addition that changes the order of addends?

Commutative Property of Addition

200

The property of addition that changes the grouping of the addends?

Associative Property of Addition

300

Numbers that make math computation easier?

Compatible Numbers

400

Two numbers or expressions that have the same value are...

equivalent

500

One way to estimate an answer is to ________ the numbers and then do the calculation.

round