A selection of our very best maths resources entirely free, updated each month.
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Convert time from a.m. and p.m. to 24-hour clock.
Add 10 and subtract 1 to help answer these questions really quickly.
Subtracting 9 by subtracting 10 and adding 1.
Adding 99 by adding 100 and subtracting 1.
Subtract 99 by subtracting 100 and adding 1.
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