6th Math Review Chapter 4

Estimating sums and Differences

100

Round to the nearest tenth 

1.769 + 0.686 = 

1.8 + 0.7 = 2.5

200

Round to nearest tenth 

20.45 - 13.15 

20.5 - 13.2 = 7.3

300

Round to nearest whole number 

72.43 - 59.8

72 - 60 = 12

400

Round to nearest whole number

376.52 - 9.14

377 - 9 = 368

500

Estimate to find the answer 

7.12 + 2.501 + 9.2 

19

Adding and Subtracting Decimals

100

5.9 +2.7

8.6

200

15 - 6.108

8.892

300

Solve 

p - 1.056

p = 1.5

0.444

400

4.815 + 2.17 

6.985

500

0.46 - x 

x = 0.333

0.127

Solve for a variable

100

13.7 + r = 21.4 

r = 7.7

200

13.27 = t - 24.45

37.72

300

18 = C + 0.8

17.2

400

24.5 + d = 56.03

d = 31.53

500

43.2 = u - 12.6 

55.8

Estimating Products

100

Estimate

42 X 9.25  

40 X 9 = 360

200

Estimate 

6.8 X 53

7 x 50 = 350 

300

Estimate 

11.3 X 0.8

11 x 1 = 11

400

Estimate 20.2 x 1.96

20 x 2 = 40

500

973 x 4.8

Estimate 

970 X 5 = 4,850

Multiplying Decimals

100

4 x 0.94

3.76

200

3.9 x 0.08 

0.312

300

0.9 x 36

32.4

400

17 x 4.765

81.005

500

2.123 x 3.9

8.2797