GCSE Maths (AQA)

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Adding & Subtracting Decimals

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Number Structure and Calculation

Adding & Subtracting Decimals

3:24 Adding and Subtracting Decimals
Spec N2
Previous Decimal Places Next Multiplying by 0.1
  • The same methods can be used for adding and subtracting decimals as for whole numbers
  • It is important for students to be able to manipulate decimals comfortably
  • The method shown is one way to add and subtract decimals, but other methods can also be used
  • To add decimals, line up the digits and decimals, fill in any zeros to make the decimals the same length, and then add the columns starting from the right
  • To subtract decimals, follow the same steps as for addition, but subtract the columns instead of adding them
  • It may be necessary to borrow from the next column when subtracting decimals
  • The decimal point should be placed in the answer so that it lines up with the columns above

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