Number Bonds to 20 - Free Game for Kids
Extend your number bond knowledge to 20. A natural next step after mastering bonds to 10, this game builds confidence with teen numbers and bigger sums.
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How to Play
Number Bonds to 20 follows the same engaging format as Number Bonds to 10 but expands the number space. The bond diagram now shows 20 at the top, and children find the missing partner number - which can range from 0 to 20. The game leans on children's existing bonds-to-10 knowledge, making the progression feel manageable rather than daunting.
Four game modes keep practice fresh: Bond Builder (drag numbers into the correct bubble), Double Ten-Frame (two rows of 10 where you color in the right number of squares), Missing Partner (four multiple-choice options), and Challenge Mode where the bond target changes - sometimes 15, sometimes 18 - to extend understanding beyond just 20. Each mode awards stars based on accuracy and speed.
What Kids Learn
Extending number bonds to 20 is where mental arithmetic starts to feel genuinely powerful. Children who know that 13 + 7 = 20 can quickly calculate 130 + 70 = 200, 1.3 + 0.7 = 2, or that change from £20 for an £13 purchase is £7. The pattern holds at every scale - making bonds to 20 one of the highest-value things to memorize in early math.
The double ten-frame visual is particularly important: it reinforces that teen numbers are "ten and some more" (13 is a full ten-frame row plus 3). This concrete understanding of the structure of numbers in the teens is foundational for understanding place value, column addition, and the number line - all core concepts in the early primary curriculum.
Tips for Parents
Use a 20-bead abacus (or 20 objects lined up) to make the bond diagrams physical before moving to the screen game. Seeing 13 beads on one side and 7 on the other - and flipping the perspective - builds the flexibility that makes bonds automatic. Compare with bonds to 10 explicitly: "You know 3 + 7 = 10. What do you think 13 + 7 equals?" This guided discovery is more powerful than being told the answer. Once bonds to 20 are solid, simple mental addition and subtraction of two-digit numbers becomes dramatically easier.
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About Number Bonds to 20
Number Bonds to 20 is a free educational game for kids ages 5-8, available to play instantly in your browser - no download, no sign-up, no cost. It's one of our most popular math games, perfect for parents and teachers looking for safe, ad-light learning content.
Designed with young learners in mind, Number Bonds to 20 balances fun and education so that kids stay engaged while quietly building skills. Each session is self-contained, so children can play for just a few minutes or settle in for a longer session - it works either way.
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