How do I check my "times 3" answer?

Answer 1

Hello.

Another way you can check your "times 3" answer is to use repeated addition.

For example, 8 x 3 = 8 + 8 + 8

and 4 x 3 = 4 + 4 + 4

and 2 x 3 = 2 + 2 + 2

After all, multiplication is really just repeated addition. I hope that helps.

Answer 2

If the digits add up to 3 or 6 or 9 or 12 or 15 or 18 the answer is OK.

Try these numbers: 111, 282, 501

111 adds up to 3 - Check your "times 3" (3 x 37 = 111)

282 = adds up to 12 - Check your "times 3" (3 x 94 = 282)

501 = adds up to 6 - Check your "times 3" (3 x 167 = 501)

Now you can tell your friends that you know the numbers are "times 3" numbers!