Missing Addends Within 10
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Skill: Finding the missing addend in addition equations within 10
10 versions, each with its own answer key
Same skill and layout, a fresh set of problems in every version, so children can keep practicing without repeating a page. Problems are not repeated between versions unless a skill has only a small number of possible problems (for example, the addition facts within 10).
- Version 1: Sheet · Key · Both
- Version 2: Sheet · Key · Both
- Version 3: Sheet · Key · Both
- Version 4: Sheet · Key · Both
- Version 5: Sheet · Key · Both
- Version 6: Sheet · Key · Both
- Version 7: Sheet · Key · Both
- Version 8: Sheet · Key · Both
- Version 9: Sheet · Key · Both
- Version 10: Sheet · Key · Both
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About this worksheet
Finding a missing addend is the bridge between addition and subtraction. When children see 3 + ___ = 8, they are really asking, "3 plus what makes 8?" which is the same thinking used in 8 - 3. This first-grade worksheet gives twenty equations within 10 where one addend is missing. Sometimes the blank is first (? + 4 = 9) and sometimes it is second (6 + ? = 10), so children practice both positions.
Working with totals no larger than 10 keeps the focus on the unknown-addend idea rather than on large numbers. Facts with zero and facts that make ten are included, because those patterns help children later with make-a-ten strategies.
How to use it: start with counters or fingers. Show the known part, then ask how many more are needed to reach the total. A number bond or a ten-frame with some filled squares makes the missing part visible. Encourage think-addition language: "What goes with 5 to make 9?" rather than only counting up one by one. When a problem is missed, rewrite it as a subtraction fact and solve both ways.
The answer key lists every missing number. This worksheet supports Common Core standards 1.OA.D.8 (determine the unknown whole number in an addition or subtraction equation) and 1.OA.B.4 (understand subtraction as an unknown-addend problem). It pairs well with our Addition Within 10 and Number Bonds to 10 worksheets.
