2nbt8 Worksheets

Number and Operations in Base Ten Use place value understanding and properties of operations to add and subtract. 8Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900.

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2nbt8

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Adding-Subtracting 10s and 100s

2nbt8

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.