How to subtract numbers
To subtract numbers from each other you can use a variety of written methods such as the column method, or a number line; or you could use a mental arithmetic method.
Resources for physically subtracting numbers together could include: an abacus, a 1000 square, Cuisinaire rods, Numicon, Base 10 or simply use cubes or counters.
Try using more than one method and practice checking your answers with a calculator.
Government guidelines (Year 3)
Pupils should be taught to:
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Subtraction worksheets - Year 3 Primary maths resources, activities and worksheets
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Subtracting from numbers, up to 1000