3-Digit by 2-Digit
Estimate 42 X 21
Round to nearest 100
40 X 20 = 800
25 X 7
175
Estimate 56 x 10
Round to nearest hundred
60 x 10 = 600
8 X 20
160
Estimate 38 X 72
Round to nearest 100
40 X 70 = 2800
18 X 6
108
Estimate 35 X 35
Round to nearest 100
40 X 40 = 1600
16x7
112
Estimate 63 X 32
Round to nearest 100
60 X 30 = 1800
12x13
156