Missing Addends Worksheet Generator
Make printable missing addends worksheets in seconds. Students solve for the missing number in addition equations, like ___ + 4 = 9 or 5 + ___ = 12. Choose the number range and which position is missing, pick easy, standard, or challenge, then print or download a clean PDF with a matching answer key. Free, no sign-up, and everything stays in your browser.
PDF puts the answer key on its own page.
Missing Addends
20 problems · Mixed positions · within 20 · Standard
Name: ______________________ Date: ____________
Answer key
Answer Key · Missing Addends
20 problems · Mixed positions · within 20 · Standard
How to use the missing addends worksheet generator
- 1Choose the equation style, the number range, and the difficulty.
- 2Pick how many problems and whether to show a name and date line.
- 3Press Regenerate for a fresh set of equations anytime.
- 4Print the worksheet, or download a PDF with the answer key on its own page.
When this is useful
Missing addend practice
Give students focused practice finding the missing number in an addition equation.
Missing number addition
Blank the first or second addend so students work backward from the sum.
Addition fact fluency
Solving for a missing addend reinforces addition facts in both directions.
Part-part-whole practice
Missing addends mirror the part-part-whole model, where students find the missing part.
Early algebra thinking
Finding an unknown in an equation is a first step toward solving for a variable.
Homework, centers, and intervention
Send a set home, keep a stack at a center, or use small ranges for targeted support.
Examples to try
A missing addends within 10 worksheet
Use the within 10 range and one missing addend for early learners.
A missing addends within 20 worksheet
Step up to within 20 once students understand the idea.
A missing number addition worksheet
Mix the missing first and second addend so students stay flexible.
A find the missing addend worksheet
Keep the sum showing and blank an addend for students to solve.
A mixed missing position worksheet
Use the mixed style to blank the first addend, the second addend, or the sum.
A printable answer key
Turn on the answer key so every missing number is filled in for fast grading.
Tips for better results
Start with sums within 10
Small sums let students focus on the missing-number idea before the numbers get larger.
Use part-part-whole models
Number bonds and part-part-whole frames help students see why subtraction finds the part.
Move to within 20 next
Once students are comfortable, the within 20 range builds toward fluency.
Mix the missing position
Blanking the first addend, the second addend, and the sum keeps students thinking.
Print the answer key separately
The PDF puts the answer key on its own page, so you can keep it apart from the student copy.
Regenerate for different groups
Press Regenerate to make a fresh set with the same settings for another group or retake.
How the missing addends worksheet generator works
You choose the equation style, the number range, and the difficulty, and the generator builds matching addition equations. Each equation is created by picking the addends and the sum first, then leaving one number blank, so the missing value is always a non-negative whole number and the equation is correct by construction.
Blanking an addend asks students to work backward from the sum, while blanking the sum is a straight addition. The mixed style varies which number is missing, and the challenge level brings in larger sums and optional three-addend equations like 8 + ___ + 5 = 20. Zero shows up as an answer now and then, but never too often.
Everything is generated on your device, so you can make as many fresh worksheets as you like, instantly and for free. Press Regenerate for a brand-new set using the same settings.
Private by design
- No account and no sign-up. Just open it and start.
- Everything runs on your device, so the worksheet settings you choose and the equations and answers you create stays with you.
- Nothing you create is uploaded. No values, names, scores, or generated content are sent to our servers.
- We use Google Analytics only for basic, anonymous pageview counts. It never receives what you enter into the tool.
Frequently asked questions
Is the missing addends worksheet generator free?
Yes, completely free, with no account and no limit on how many worksheets you make. There's no watermark on the printed sheet.
Can I print missing addend worksheets?
Yes. Use the Print button to send the worksheet straight to your printer. Only the worksheet prints, with clean, readable equations, and nothing else from the web page.
Can I download a PDF?
Yes. Download a clean PDF built right on your device, with the problems on the first page and, when enabled, an answer key on its own page.
Does it include an answer key?
Yes. Turn on the answer key and every missing number is filled in, so grading a whole sheet takes just a minute.
Can I make missing number addition worksheets?
Yes. Choose the missing first addend, missing second addend, missing sum, or mixed positions.
Can I choose the number range?
Yes. Pick within 10, within 20, within 50, within 100, or within 1,000 for the challenge level.
Can I make worksheets within 10 or within 20?
Yes. The within 10 and within 20 ranges are great for early addition and missing-addend practice.
Are worksheet settings or answers uploaded or saved anywhere?
No. The worksheet is built entirely on your device, and the PDF is created there too, so your settings, equations, and answers are never uploaded or stored on a server.
Helpful supplies for this activity
Optional supplies that can make printed classroom materials easier to reuse, organize, or share.
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