2.3.3
Add & Subtract Volumes
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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).
1Year 3 - Number
1.1Number & Place Value
1.2Addition & Subtraction
1.3Multiplication & Division
2Year 3 - Measurement
2.3Volume & Capacity
3Year 3 - Geometry
3.2Properties of Shapes
3.3Straight Lines
4Year 3 - Statistics
4.1Statistics
5Year 4 - Number
5.1Number & Place Value
5.2Addition & Subtraction
5.3Multiplication & Division
6Year 4 - Measurement
7Year 4 - Geometry
7.1Properties of Shapes
7.2Perimeter & Area
7.3Position & Direction
8Year 4 - Statistics
Jump to other topics
1Year 3 - Number
1.1Number & Place Value
1.2Addition & Subtraction
1.3Multiplication & Division
2Year 3 - Measurement
2.3Volume & Capacity
3Year 3 - Geometry
3.2Properties of Shapes
3.3Straight Lines
4Year 3 - Statistics
4.1Statistics
5Year 4 - Number
5.1Number & Place Value
5.2Addition & Subtraction
5.3Multiplication & Division
6Year 4 - Measurement
7Year 4 - Geometry
7.1Properties of Shapes
7.2Perimeter & Area
7.3Position & Direction
8Year 4 - Statistics
Practice questions on Add & Subtract Volumes
Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.
- 1
- 2What is 357 mƖ + 542 mƖ?Multiple choice
- 3What is 50 Ɩ - 37 Ɩ?Multiple choice
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