Estimation Questions
Adding Decimals
Subtracting Decimals
Multiplying Decimals
100

6.7 + 8.9 =

About 16

100

6.89 + 4.6 =

11.49

100

8.6 - 5.3

3.3 

100

8.5 x 4.5 =

38.25

200

56.6 + 13.6 = 

About 71

200

18.35 + 25.19 

43.54

200

87.2 - 5.23 = 

81.97

200

5.26 x 3.2 =

168.32

300

5.6 x 1.2 = 

About 6

300

85.6 + 8.43

94.03 

300

45.674 - 32.45 = 

132.224

300

3.3 x 5.23 =

17.259

400

34.8 x 9.2 =

About 315

400

89.56 + 345.65 =

435.21

400

598.23 - 31.2 = 

567.03 

400

25.2 x 6.2

156.24

500

67.345 + 678.4 =

 

About 745 

500

678.98 + 123.57

802.55

500

600.78 - 56.67

544.11

500

23.7 x 8.45

200.265