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Rounding to decimal places

You learn to round a decimal to a whole number or to a number of decimal places.

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How to work it out

  1. Count how many digits after the decimal point you are allowed to keep.
  2. Look at the digit that comes next.
  3. If it is 5 or more, your last digit goes up one.
  4. If it is less, it stays the same.

Round 3.14 to 1 decimal place

  1. You keep 1 digit after the decimal point.
  2. Look at the next digit: the 4.
  3. That is less than 5, so round down: 3.1.
More examples

Round 16.5 to the nearest whole number

  1. You keep no digits after the decimal point.
  2. Look at the first digit after it: the 5.
  3. That is 5 or more, so round up: 17.

Round 4.568 to 2 decimal places

  1. You keep 2 digits after the decimal point.
  2. Look at the next digit: the 8.
  3. That is 5 or more, so round up: 4.57.