Missing Number Within 100

2.NBT.5 — Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction

Build this worksheet below — all three levels and the answer key, ready to print.

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What is on the three Missing Number Within 100 worksheets

Support: draws base-ten blocks beside every problem.
On level: The grade's own level, with no drawings.
Challenge: moves the missing number out of the answer slot, and uses the harder cases.

Example problems from the on-level sheet

___ + 38 = 88
___ + 19 = 50
___ + 76 = 89

Every sheet is generated, so the numbers are different each time you make one.

Before this: 1.NBT.4 — add within 100: two-digit plus one-digit, and two-digit plus a multiple of 10.