There are different ways to approach a 2-digit by a 1-digit multiplication problem. Look at this multiplication problem. 16 × 4 = ? Here are some different ways you might solve it.

You can use different methods to multiply a two-digit number by a one-digit number in your head. Multiplying by 2 is the same as doubling. 27 × 2 = 54 You can visualise this using place value ...