NumberKey Stage 3

Multiplying decimals

Multiply decimals using a whole-number calculation.

  • Multiply the digits as whole numbers first.
  • Count the decimal places in both original numbers together.
  • Use that total to place the decimal point in the product.

Example 1

Calculate.

Line up equal place values.

Apply this to both sides.

Multiply as whole numbers, then put back 2 decimal places in total.

Example 2

Calculate.

Line up equal place values.

Apply this to both sides.

Multiply as whole numbers, then put back 3 decimal places in total.

Remember
Use that total to place the decimal point in the product.

Your turn

Question 1

Calculate.

Check answer

Line up equal place values.

Apply this to both sides.

Multiply as whole numbers, then put back 2 decimal places in total.

Question 2

Calculate.

Check answer

Line up equal place values.

Apply this to both sides.

Multiply as whole numbers, then put back 3 decimal places in total.

Question 3

Calculate.

Check answer

Line up equal place values.

Apply this to both sides.

Multiply as whole numbers, then put back 3 decimal places in total.

Question 4

Calculate.

Check answer

Line up equal place values.

Apply this to both sides.

Multiply as whole numbers, then put back 3 decimal places in total.

Question 5

Calculate.

Check answer

Line up equal place values.

Apply this to both sides.

Multiply as whole numbers, then put back 3 decimal places in total.

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