Adding a multiple of 100 means combining whole hundreds: the hundreds place increases by the corresponding number of hundreds while the tens and ones remain unchanged. For three-digit numbers with results within 1,000, this reasoning supports efficient mental addition and can be represented by jumps of 100 on a number line or by place-value notation; it does not include larger numbers or generalized algorithms beyond this range.
To add a multiple of , add whole hundreds. The tens and ones digits stay the same.
Example:
Therefore,
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