FASTER ADDITION.
Addition is often faster in two steps instead of one.
For example,
487 + 38 = (487 + 13) + (38 - 13) = 500 + 25 = 525.
A generic advice might be given as "First add what's
easy, next whatever remains". Another example:
1049 + 187 = 1100 + (187 - 51) = 1200 + 36 = 1236.
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