Number Bonds Generator
Part-part-whole circles with one number missing — the diagram that turns addition facts into number sense. Free PDF with answer key.
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Activity
Numbers
How Many Bonds
Steer the Bonds
Set both parts and which circle is blank.
- #1+= 8
- #2+= 3
- #3+= 4
- #4+= 8
- #5+= 4
- #6+= 8
Worksheet Title
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Paper
Parts, wholes, and fact families
A number bond shows a whole split into two parts: 7 joins to 3 and 4. Filling the missing circle teaches that addition and subtraction are the same relationship seen from different sides — if 3 + 4 = 7, then 7 − 3 = 4. That’s the thinking behind fact families and mental math.
Three activities: missing part (the classic — the whole and one part are given), find the whole (add the parts), and mixed. The bonds of 10 mode drills every pair that makes ten — the single most useful set of facts a young mathematician can own. Steer every bond, lock the ones you like, and print a fresh sheet whenever.
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