Some people (especially those who still use feet and inches!!) think it is important to know how to multiply by 12. It?s easy ? just add 10 times the number to 2 times the number.

When multiplying 2-digit numbers by 1-digit in your head usually it is easier to start with the tens.

Multiplying three digit multiples of 100 is fairly easy, but there are some addition adjustments to make on some of these.

Multiply by 10, 100 and 1,000 using Gattegno charts.