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Adding-Subtracting 10s and 100s
- Find 10 more or 10 less than a number by changing the tens digit.
- Find 100 more or 100 less than a number by changing the hundreds digit.
- Use place value to keep the ones digit the same when adding or subtracting tens and hundreds.
- Do quick mental math with three-digit numbers without writing out long addition or subtraction.
