How to multiply in your head

When multiplying by 10 in our heads, we can move each number a place value column to the left and add a zero.

What is 6 x 40?

• 6 x 40 is equal to 6 x 4 x 10
• 6 x 4 is equal to 6 x 2 x 2
• 6 x 2 x 2 = 24
• 24 x 10 = 240
• This means 6 x 40 = 240

Break down the calculation as much as you need to. If you know 6 x 4 = 24, you don't have to break it down into 6 x 2 x 2.

What is 0.2 x 10 ?

We move each number a place value to the left and add a zero at the end.

0.2 x 10 = 2