🔗 Number Bonds

What you’ll learn

1. Partners That Make 10Find the number that makes 10 when added to any number from 1 to 9.When two numbers add to exactly 10, they are number bonds or 'ten friends', like 7 and 3. Your ten fingers help you find them, and knowing them by heart speeds up all your math. Not every pair makes 10 — some fall short and some go over.
2. Numbers in Two PartsDecompose numbers up to 10 into pairs in more than one way (part-part-whole).Numbers can be split into two parts in many ways. 5 can be 1 and 4, 2 and 3, or 0 and 5. This is part-part-whole: the two parts always add back up to the whole. Knowing all the parts of a number makes you a flexible, speedy thinker.
3. Bonds with the Ten-FrameUse a ten-frame to find the complement to 10 and see amounts at a glance.A ten-frame is two rows of five, ten boxes in all. Fill some with counters and the empty boxes show the ten friend — 7 full means 3 empty. Best of all, the ten-frame teaches you to SEE amounts at a glance instead of counting one by one, making math faster.
4. Bonds Within 20Recall addition facts within 20 using the make-ten strategy.Number bonds go beyond 10. To add 8 + 5, split the 5 into 2 and 3, make 8 into 10, then add the leftover 3: 10 + 3 = 13. This make-ten trick uses ten friends to solve facts within 20. Practice makes these facts pop into your head fast.
5. Bonds Help SubtractRecall related subtraction facts within 20 using known addition bonds.Each bond is a family of facts: 8 + 5 = 13 also tells you 13 - 5 = 8 and 13 - 8 = 5. So you can use adding facts you know to solve subtraction quickly. With practice, both adding and subtracting facts pop into your head instantly.

Questions this course answers

Grounded in trusted sources

• Khan Academy Kids
• PBS Kids — early math
• NAEYC — early math learning
• Britannica Kids

Every Wunder lesson is built from real, reputable sources — never invented.

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