Estimate
24 x 4
20 x 4 = 80
3 x 23
69
121 x 4
484
32 x 8
ESTIMATE: 30 x 8 = 240
SOLUTION: 32 x 8 = 256
53 x 2
50 x 2 = 100
63 x 6
378
712 x 6
4,272
123 x 7
ESTIMATE: 100 x 7 = 700
SOLUTION: 123 x 7 = 861
5 x 671
5 x 700 = 3,500
83 x 6
498
580 x 9
5,220
8 x 719
ESTIMATE: 8 x 700 = 5,600
SOLUTION: 8 x 719 = 5,752
415 x 8
400 x 8 = 3,200
97 x 5
485
692 x 5
3,460
792 x 9
ESTIMATE: 800 x 9 = 7,200
SOLUTION: 792 x 9 = 7,128