estimating problems
Problems using x20 and x30 and x40 and x50
multiplying numbers with 0's
100
20 x 63
What is 20 x 60?
100
20 x 63?
What is 1,260?
100
20 x 20
What is 400
200
93 x 40
What is 90 x 40?
200
84 x 30
What is 2,520
200
30 x 40
What is 1200?
300
84 x 30
What is 80 x 30?
300
93 x 40
What is 3,720
300
40 x 60?
What is 2400?
400
50 x 76
What is 50 x 80?
400
50 x 76
What is 3,800
400
50 x 60?
What is 3,000
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