CCSS 2.NBT.8 Worksheets

CCSS 2.NBT.8 (Common Core, 2nd Grade): "Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900." The worksheets below practice this standard. Each one is a free printable PDF with an answer key, comes in multiple versions, and can also be assigned digitally - no login or account needed.

2nbt7

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.

2nbt9

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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.