2nd grade missing addends worksheets

Second graders use missing addends to move from computing answers to reasoning about them. Working backward from the total (what plus 3 makes 8) is the step that separates memorized facts from real number sense.

Free printable PDF worksheet, aligned to Common Core 2.OA.B.2.

A new sheet every click.

Tap to see another sample sheet.

The kind of problems you'll get

Find the missing number.

  1. 6 + ___ = 18

    Answer: 12

  2. ___ + 3 = 11
  3. 12 − ___ = 4

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 each sheet

Every version prints on US Letter or A4, with its answer key on the last page.

How to teach this

Ask for the related fact out loud: for ___ + 3 = 8, the partner is 8 − 3. Mix in the subtraction form so your child doesn't settle into one routine. Reread each completed equation together to confirm both sides agree.

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 missing addends

My child just adds the two numbers shown. What helps?
Have them read the equation aloud as a question first: four plus what makes nine? Naming the total before solving usually fixes it.
Do the sheets repeat problems?
No. Every print generates a fresh set, so your child gets new practice each round.

Related worksheets

Ready to print one?

Need a fresh set of questions? Download another copy.

Aligned to Common Core 2.OA.B.2. Reviewed by the One more sheet curriculum team. Content version 123, updated July 2026.