Single-Digit Addition — Missing Addends Worksheets for 1st Grade
Solve for the missing number in a single-digit addition sentence. 15 free printable worksheets, each with an answer key.
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Click a worksheet to open the PDF, or grab the matching answer key. Every sheet prints on one page.
Worksheet #1
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Worksheet #4
Worksheet #5
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Worksheet #9
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Worksheet #14
Worksheet #15
Single-Digit Addition — Missing Addends: what children learn
Missing-addend problems (like "5 + __ = 9") flip standard addition around — they build the same algebraic thinking kids will need for subtraction and, eventually, real algebra.
Single-Digit Addition — Missing Addends: worked example
5 + __ = 9 4
Think "5 plus what equals 9?" Counting on from 5 to 9 takes 4 steps, so the missing number is 4.
Single-Digit Addition — Missing Addends: a common mistake to watch for
Kids sometimes just add the two visible numbers (5 + 9 = 14) instead of recognizing one of them is the answer, not an addend — reading the equation aloud as a question helps.
Single-Digit Addition — Missing Addends: how to help at home or in class
Put a handful of counters in your hand, show your child the total, and let them see you drop some into a cup. Ask how many are in the cup. Use a few of the same situations until your child starts counting up from the part they can see to the total. Write the matching equation with a box for the cup. When your child can solve these without counters and tell you how, move on to bigger totals.
What is on these Single-Digit Addition — Missing Addends worksheets
This set has 15 different worksheets for 1st grade, with 23 questions on each and a matching answer key for every sheet. The instruction printed on each worksheet is: “Find the missing number.”
Example questions like the ones on these worksheets, with their answers:
- 4 + __ = 106
- 2 + __ = 97
- __ + 8 = 91
- 7 + __ = 103
- __ + 0 = 00
- __ + 2 = 42
- 1 + __ = 65
- 3 + __ = 85
Every answer on every sheet is checked by a separate program before the worksheet is published. How we check answers