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How to do the estimation problem (727X2) in the first volume of mathematics in grade three?
Practice 1. If 727 is regarded as 730, the topic becomes 730X2= 1460.

Method 2: If 727 is regarded as 700, the topic becomes 700X2= 1400.

Thirdly, if 727 is regarded as 1000, the topic becomes 1000X2=2000.

Which method to choose depends on the accuracy of the topic.