Use known facts to add and subtract multiples of 100 within 1000
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I can add and subtract multiples of 100
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Known facts can be used to help calculate with multiples of a hundred.
If we know that 2 ones plus 4 ones equals 6 ones we know that 2 100s plus 4 100s equals 6 100s.
Number facts to 10 can help us to add and subtract multiples of a hundred.
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