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Checking calculation of mathematical multiplication in the second volume of the third grade
Multiplication is calculated as follows:

1, and then multiply the two two-digit exchange positions.

2. Check by department.

For example:1/kloc-0 /×12 =132.

Check calculation:

1、 12× 1 1= 132

2、 132÷ 1 1= 12

3、 132÷ 12= 1 1