M2 Lesson 12 Review

Estimate and Solve 1

100

1a.     24 x 2.31

Estimate: 

24 x 2 = 48

Actual Answer: 55.44

200

1b.    5.42 x 305

Estimate: 5 x 300 = 1500

Actual Answer: 1653.1

300

2a.     1.23 x 21 

Estimate: 1 x 20 = 20 

Actual Answer: 25.83

400

2b.   3.2 x 41

Estimate: 3 x 40 = 120

Actual Answer: 131.2

500

2c.   0.32 x 41 

Estimate: 0.3 x 40 = 12

Actual Answer: 13.12

Estimate and Solve 2

200

2d. 0.54 x 62

Estimate:  0.5 x 60 = 30

Actual Answer: 33.48

300

2e. 6.09 x 28

Estimate: 6 x 30 = 180

Actual Answer: 170.52

400

2f.      6.83 x 683

Estimate:  7 x 700 = 4900

Actual Answer: 4664.89

500

2g.     6.09 x 208

Estimate: 6 x 200 = 1200

Actual Answer: 1266.72

Estimate and Solve 3

500

This question is worth 1000 points. 

2h. 171.76 x 555

Estimate: 200 x 600 = 120000

Actual Answer: 95,326.8