Grade 1 Missing Addend Addition Worksheets
Start with eight focused practice problems, then use the answer key below to check the worksheet.
Practice Worksheet
Grade 1 Missing Addend Addition Practice
Solve each problem. Show your work.
- 1.14 + ___ = 15
- 2.4 + ___ = 7
- 3.6 + ___ = 7
- 4.5 + ___ = 11
- 5.13 + ___ = 16
- 6.9 + ___ = 10
- 7.8 + ___ = 11
- 8.12 + ___ = 17
Show answer key
- Question 1: 1
- Question 2: 3
- Question 3: 1
- Question 4: 6
- Question 5: 3
- Question 6: 1
- Question 7: 3
- Question 8: 5
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About These Worksheets
Grade 1 students solve missing addend problems within 20, often using counters or number lines to find the unknown number.
Missing addend worksheets present problems like 7 + __ = 12, where students must find the unknown number that completes an addition sentence rather than simply computing a sum. This small shift in format has an outsized effect: it introduces algebraic thinking years before students see a formal equation with a variable, and it strengthens the connection between addition and subtraction as inverse operations.
To solve a missing addend problem, students typically reason "what do I need to add to 7 to reach 12?" — which is functionally a subtraction problem in disguise. Practising this skill helps students see addition and subtraction as two views of the same relationship, a concept that pays off throughout elementary math and directly prepares students for solving equations in later grades.
Skills Practised
- Solving addition sentences with an unknown addend
- Using the relationship between addition and subtraction to find missing values
- Reasoning about "how many more" to reach a target sum
- Checking a missing addend answer by substituting it back into the equation
- Building early algebraic thinking through fill-in-the-blank equations
Parent Tip: Frame missing addend problems as questions instead of equations — ask "7 and what makes 12?" rather than reading the blank as a fill-in-the-box exercise. It keeps the reasoning natural.