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.

All the questions on these pagers can be done mentally: the important part is explaining the method that was used.

Using mental methods to multiply decimals by 10, 100 and 1000.