1.NBT.C.5 Worksheets: 10 More and 10 Less
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1.NBT.C.5 (Number and Operations in Base Ten): Find 10 more or 10 less than a two-digit number in your head.
About this standard
This standard asks children to find 10 more or 10 less than a two-digit number in their head, without counting by ones. The key idea is that only the tens digit changes, so 47 becomes 57 or 37. Practice with 10 More and 10 Less and Counting by 10s From Any Number; for adding whole tens see 1.NBT.C.4.
