This Maths article explains both the mental method and written method for multiplying a 2-digit number by a 1-digit number.

To help you understand the algorithm, the video shows a simple two-digit by two-digit multiplication. You can see that the first and last digits are essentially the result of one multiplication.

Using your times tables knowledge for small single-digit multiplication equations is great. When you are asked to multiply any two, three or four-digit number by multiples of ten, or any two-digit ...