Number Bonds to 20 worksheet - Free Printable

Let’s work through each number bond one by one.

Remember: A number bond to 20 means two numbers that add up to the total shown (like 17, 15, 12, etc.). So if you see a big number on the left, and one part on the right, you subtract to find the missing part.

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Row 1, Left:
Total = 17
One part = 7
Missing part = 17 - 7 = 10

Row 1, Right:
Total = 17
One part = 11
Missing part = 17 - 11 = 6

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Row 2, Left:
Total = 15
One part = 9
Missing part = 15 - 9 = 6

Row 2, Right:
Total = 15
One part = 6
Missing part = 15 - 6 = 9

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Row 3, Left:
Total = 12
One part = 4
Missing part = 12 - 4 = 8

Row 3, Right:
Total = 12
One part = 9
Missing part = 12 - 9 = 3

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Row 4, Left:
Total = 18
One part = 7
Missing part = 18 - 7 = 11

Row 4, Right:
Total = 17
One part = 10
Missing part = 17 - 10 = 7

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Row 5, Left:
Total = 20
One part = 10
Missing part = 20 - 10 = 10

Row 5, Right:
Total = 17
One part = 6
Missing part = 17 - 6 = 11

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All calculations checked. Ready to write final answers in order as they appear in the worksheet.

Final Answer:
10, 6, 6, 9, 8, 3, 11, 7, 10, 11