2.NBT.B.8 Worksheets: Add and Subtract 10 and 100 Mentally
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2.NBT.B.8 (Number and Operations in Base Ten): Add or subtract 10 or 100 to a number from 100 to 900 in your head.
About this standard
Second graders mentally add or subtract 10 or 100 from any number between 100 and 900. Knowing which digit changes is the whole trick, and base-ten blocks make it easy to see. Practice with 10 More, 10 Less, 100 More, 100 Less and Adding and Subtracting 10 and 100; for the two-digit version from first grade, see 1.NBT.C.5.
