Q:

# How do you multiply two-digit numbers?

A:

Two-digit numbers can be multiplied by lining up the ones value and the tens value and summing the vertical lines. If a two-digit number is multiplied by a one-digit number, then the ones value and the tens value are summed separately and the former is added after the latter.

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As an example, when multiplying 23 by 3, once the numbers are lined up the two equations are 3 times 3 for the ones value and 3 times 2 for the tens value. The first equation gives an answer of 9, while the second results in 6. However, the 6 is actually 60 because it is the answer from the tens column. Once this is done, 6 and 9 can be joined together to make 69.

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