This understanding connects subtracting 100, 200, or another multiple of 100 from a whole number through place value: the hundreds digit decreases by the corresponding number of hundreds while the tens and ones digits remain unchanged. It includes mentally finding nonnegative differences with numbers through 1,000, using equations, place-value representations, or an open number line, but does not include decimal numbers, negative results, or more advanced generalizations to larger numbers.
To subtract a multiple of , look at the hundreds digit. Subtract the number of hundreds, and keep the tens and ones digits the same.
Example: Find .
So,
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