Why does the blank come first in some problems?

Problems like ___ + 3 = 8 stop kids from solving on autopilot. Reading the whole equation is part of the skill.

Is this the same as subtraction?

It's the doorway to it. 1st grade standards define subtraction as finding a missing addend, which is exactly what these sheets practice.

1st grade missing addends

1st grade missing addends worksheets

Missing-addend problems like 4 + ___ = 9 teach 1st graders that an equation is a question about a missing part. Your child counts up from the known number to find what fits, the same thinking that makes subtraction click.

Free printable PDF worksheet, aligned to Common Core 1.OA.B.4, 1.OA.D.8.

Each print is a different sheet with its own answer key. You don't need to sign up.

The kind of problems you'll get

Find each missing addend.

+ 1 = 7
Answer: 6
+ 2 = 3
Answer: 1
2 + = 4
Answer: 2

Every print pulls a fresh set of problems at this level, so a make-up test or a second sibling never gets the same sheet.

What's on a 1st grade sheet

The sample sheet above has 12 problems. Its answers run from 0 to 10.

Missing addends. Find each missing addend. 12 problems per page.

Every version prints on US Letter or A4, with its answer key after the problems.

How to teach this

Cover the blank with a finger and read the equation as a question: four plus what makes nine? Let your child count up on fingers or a number line at first. Then have them read the finished equation back to check that it's true.

Watch for: Kids add the two numbers they can see. In 4 + ___ = 9, the 9 is the total, not a number to add. Kids expect the answer after the equal sign. Here the blank can sit anywhere in the equation.

Common questions about 1st grade missing addends

Why does the blank come first in some problems?: Problems like ___ + 3 = 8 stop kids from solving on autopilot. Reading the whole equation is part of the skill.
Is this the same as subtraction?: It's the doorway to it. 1st grade standards define subtraction as finding a missing addend, which is exactly what these sheets practice.

Related worksheets

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Aligned to Common Core 1.OA.B.4, 1.OA.D.8. Reviewed by the One more sheet team. Content version 241, updated October 2026.

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