ESTIMATION
ADDING DECIMALS
SUBTRACTING DECIMALS
SUBTRACT ACROSS ZEROS
100
Estimate by 65.62 + 54.32 + 48.09 by rounding each number to the nearest whole number.

66 + 54 + 48 = 168

100

3.2 + 7.5 = ?

10.7

100

16.75 - 4.21 = ?

12.54

100

50 - 42.29 =

7.71

200

Estimate to find the sum.

358 + 293

700

200

1.82 + 6 = ?

8.82

200

16 - 4.28 = ?

11.72

200

60.04 - 32.28 = ?

27.76

300

Estimate to find the difference.

15.01 - 4.4 = ?

11

300

6.52 + 4.18 = ?

10.70 or 10.7

300

8.4 - 3.8 = ? 

4.6

300

80.00 - 45.37 = ?

34.63

400

Estimate to the nearest whole number to find the sum.

80.01 + 2.89 = ?

83

400

25.6 + 13.2 + 6.4 = ?

45.2

400

8.5 - 1.7 = ?

6.8

400

50.03 - 17.98 = ?

32.05

500

An amusement park has 2 roller coasters.  One is 727 feet long, and the other is is 385 feet long.  If you ride both roller coasters, about how many feet will you travel in all?

1,100 feet

500

34.5 + 4 + 6.35 = ?

44.85

500

78.24 - 5.89 = ?

72.35

500

60.00 - 25.38 = ?

34.62

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