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Number bonds worksheet generator

Create a printable number bonds worksheet with missing-part questions such as 7 + __ = 10, or fact family blocks that pair each addition with its matching subtraction. Choose bonds to 10, 20, 50 or 100, set how many questions you need, and download the result as a US Letter or A4 PDF with an answer key.

Pick the total, preview the worksheet instantly, then download the PDF — no account needed.

Quick presets

The stacked layout applies to missing-part bonds; fact family blocks always print as four lines under one number.

Advanced settings
Number bonds worksheetName: Date: 1) + 8 = 102) + 0 = 103) 7 + = 104) + 9 = 105) 5 + = 106) + 2 = 107) 0 + = 108) 6 + = 109) + 6 = 1010) 9 + = 1011) 3 + = 10Page 1 of 2Created with Print Joey — printjoey.com
Page 1 of 2
Answer key1) 23) 35) 57) 109) 411) 72) 104) 16) 88) 410) 1Page 2 of 2Created with Print Joey — printjoey.com
Page 2 of 2 — answer key

How it works

  1. Choose the total — 10, 20, 50 or 100 — and whether you want missing-part bonds, fact families or a mix of both.
  2. Set the question count and watch the live preview update — what you see is exactly what prints.
  3. Download the PDF with the answer key, or copy a share link that restores these settings.

Using these worksheets in teaching

Number bonds are the foundation of mental addition and subtraction in elementary math: a child who recalls the pairs to ten can bridge through ten instead of counting on in ones. Stay with bonds to 10 until recall is instant, then move to 20 before widening to 50 and 100. Fact family blocks are worth introducing early — seeing 6 + 4, 4 + 6, 10 − 6 and 10 − 4 side by side builds the inverse relationship that later underpins missing-number work.

Frequently asked questions

What are number bonds?
A number bond is a pair of numbers that add to a fixed total. Bonds to 10 — 3 and 7, 4 and 6, 5 and 5 — are the first set most children learn, because knowing them instantly is what makes bridging through ten possible in mental addition.
What is the difference between bonds and fact families?
A bond question hides one part of the pair, for example 7 + __ = 10. A fact family block prints all four facts from one triad — two additions and two subtractions — so students see addition and subtraction as two views of the same relationship.
Which totals can I choose?
Bonds to 10, 20, 50 or 100. Ten and twenty suit the early years; fifty and one hundred suit students extending the same mental strategies to larger numbers.
Is there an answer key?
Yes. Turn on the answer key and it is added as clearly labeled pages at the end of the same PDF.
Can I make different versions for each student?
Yes. Choose up to 30 unique versions in one PDF — each version has its own questions and its own answer key section.

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Last reviewed: July 2026. Worksheet content is generated by deterministic algorithms and covered by automated correctness tests — no AI-generated answers.