Multiplication is generally checked by swapping positions. You can also check by division.

Solution:

Multiplication calculation is checked by division, for example:

15x 16=240 .

Check calculation:

240÷ 16= 15。

Or: 240÷ 15= 16.

So the multiplication calculation is correct.

Calculation rules of vertical division:

1. Divide by the high order of the dividend. How many factors are there? Look at the first few figures of dividends. If it's not enough, watch another one.

2. Write the quotient on the divisor. If the divisor is not enough, put the quotient 0 on this.

3. The remainder of each division must be less than the divisor. Place the digits of the divisor on the right of the remainder and continue the division.