🔗 Number Bond Builder
Find the missing part that makes 10, 20 or 100. Ten quick number-bond questions per round.
How to play
Each sum has a missing part shown with a question mark. Work out what goes with the given number to make the total, then type it in. Knowing your pairs to 10 makes the bigger totals easy.
⌨️ Keyboard: press 1–4 to pick an answer, or type your answer and press Enter.
What it teaches
Number bonds (partitioning a number into two parts) are a key Foundation to Year 2 idea. Pairs to 10 lead straight to pairs to 100 and to mental strategies like bridging through ten.
Levels: Make 10 (Pairs that total 10) · Make 20 (Pairs that total 20) · Make 100 (Pairs that total 100)
Free to play, with no sign-up and no ads beside the game. Best scores are saved only in this browser. All artwork and sounds are made in code by makekite.