Show:
Estimate
Two x One
Three x One
Solve & Estimate
100

24 x 4

20 x 4 = 80

100

3 x 23

69

100

121 x 4

484

100

32 x 8

ESTIMATE: 30 x 8 = 240

SOLUTION: 32 x 8 = 256


200

53 x 2

50 x 2 = 100

200

63 x 6

378

200

712 x 6

4,272

200

123 x 7

ESTIMATE: 100 x 7 = 700

SOLUTION: 123 x 7 = 861

300

5 x 671

5 x 700 = 3,500

300

83 x 6

498

300

580 x 9

5,220

300

8 x 719

ESTIMATE: 8 x 700 = 5,600

SOLUTION: 8 x 719 = 5,752

400

415 x 8

400 x 8 = 3,200

400

97 x 5

485

400

692 x 5

3,460

400

792 x 9

ESTIMATE: 800 x 9 = 7,200

SOLUTION: 792 x 9 = 7,128