Add & Subtract Volumes
Maths: Year 3 & 4 National Curriculum, topic 2.3.3
Adding and Subtracting Volumes
We often need to add or subtract volumes with the same unit or different units.
Same units
- You can add or subtract volumes with the same unit of measurement easily.
- Use your normal addition or subtraction method.
- Do not forget to write in the correct unit of measurement.
- 3 Ɩ + 5 Ɩ = 8 Ɩ
- 350 mƖ + 120 mƖ = 470 mƖ
Different units
- If the units of measurement are mixed, it can help to work out the millilitres and litres separately.
- For example, 3 Ɩ + 1,035 mƖ = ?
- 3 Ɩ = 3,000 mƖ
- 3,000 mƖ + 1,035 mƖ = 4,035 mƖ (or 4 Ɩ 35 mƖ).
Test yourself on Add & Subtract Volumes
A measuring cylinder is filled up to 500 mƖ as shown.
How much more would it need to be filled to reach the 750 mƖ mark?What is 357 mƖ + 542 mƖ?
What is 50 Ɩ - 37 Ɩ?