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Decimal places
Rounding decimal numbers

Decimal numbers are fractions where the denominator is a power of ten, eg tenths, hundredths, thousandths etc.

Decimal places

The number of decimal places is the number of digits after the decimal point.

This is also equal to the number of zeros in the denominator of the fraction.


Rounding decimal numbers

To round to a given number of decimal places look at the next decimal place.

  • if it is 5 or greater add one to the previous decimal place
  • if it is less than 5 leave the previous decimal place the same.


Test yourself

Round these decimals to the number of decimal places indicated. Roll your mouse over the decimal to see the answer.


Writing decimals as fractions



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