Base 10
12 x 10
120
12 x 21
252
321 x 24
7,704
253 x 124
31,372
Estimate the following: 22 x 4
20 x 4 = 80
therefore
22 x 4 ≈ 80
12 x 100
1,200
32 x 41
1,312
167 x 35
5,845
122 x 103
12,566
Estimate the following 32 x 6
30 x 6 = 180
therefore
32 x 6 ≈ 180
200 x 20
4,000
48 x 25
1,200
408 x 29
11,832
345 x 124
42,780
Estimate the following: 48 x 4
50 x 4 = 200
therefore
48 x 4 ≈ 200
200 x 400
80,000
59 x 12
708
924 x 65
60,060
650 x 402
261,300
Estimate the following: 102 x 3
100 x 3 = 300
therefore
100 x 3 ≈ 300
350 x 1000
350,000
98 x 35
3,430
192 x 43
8,256
682 x 902
615,164
Estimate the following: 198 x 2
200 x 2 = 400
therefore
198 x 2 ≈ 400