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Multiplying in your head

How to multiply in your head | Year 3 Mathematics

When we multiply a number by 10 mentally, we can easily shift each digit one place to the left and append a zero to the number.

Solved Examples

Example 1: What is 6 x 40?
Sol:
 

  • 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

Feel free to simplify the calculation further based on what you already know. If you are aware that 6 x 4 equals 24, you can skip breaking it down into 6 x 2 x 2.

Example 2: What is 0.2 x 10 ?
Sol: 

How to multiply in your head | Year 3 Mathematics

We move each number a place value to the left and add a zero at the end.
0.2 x 10 = 2

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