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

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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.

To multiply by 21, just multiply by 20 and then add the number on. (To multiply by 20, double and times by 10.)

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

All these questions are about mentally multiplying by 100 and 1000, including decimals.

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