The trick to multiplying any number by 10 is to add a zero to the end of the number.

If the numbers in the center add up to a number with two digits, insert the second number and add 1 to the first one.

The trick to multiplying any number by 10 is to add a zero to the end of the number.

If the numbers in the center add up to a number with two digits, insert the second number and add 1 to the first one.

One way to multiply a number by 9 is to multiply by 10 and then subtract the number from the product.

There is another way to multiply fast by 9 and as the first one it has an analogue for multiplication by 99, 999 and all such numbers.

Another way to do division is to keep subtracting the the divisor from the dividend until you get to the answer.

Once you’ve reached a point where subtracting by the value gives you an answer that is less than on that value, then you are done.

When multiplying the number 5 by an even number, there is a quick way to find the answer.Take the number being multiplied by 5 and cut it in half, this makes the number 4 become the number 2.

When multiplying an odd number times 5, the formula is a bit different.Add a zero to the number to find the answer. In this case, the answer is 20.

Subtract every number except the last from 9 and subtract the final number from 10

When you are subtracting large numbers, the top digit in a column is smaller than the bottom digit in that column.

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