Addition & Subtraction Game
Add and take away within 10, 20 or 100. The questions grow with your child, from 3 + 2 all the way to two-digit sums.
Ages 5–9 · US K–2nd grade · UK Reception–Year 3
Treetop Fair: a free math game
A math fair up in the trees
Adding and taking away. It gets trickier as you fly higher.
Free to play · no sign-up · read aloud · Open full screen ↗
What it teaches
- Number bonds to 10 and 20
- Adding and subtracting within 10, 20 and 100
- Missing-number thinking (8 + ? = 13)
How to play
- Press Play, then answer the question on the sign.
- Each question is a different game: hold, drag, aim or tap.
- Three hearts, twenty questions. Right answers earn tickets.
- Tickets unlock bird stickers for your Sticker Shelf.
Tips for parents
- 💡 Start within 10. Move to 20 once a whole run goes by with no hearts lost.
- 💡 If your child counts on fingers, that is fine. Speed comes with practice.
- 💡 Ask "how did you work that out?" now and then. Explaining builds number sense.
Keep learning
Addition & Subtraction Game FAQ
What range of sums does it use?
Choose within 10, within 20 or within 100 on the title screen. Answers never go below zero.
Is this good for number bonds?
Yes. Within 10 and within 20 lean heavily on number bonds, the pairs that make 10 and 20, which are the base of fast mental math.
Is it free?
Yes. Treetop Fair is free to play in the browser on phones, tablets and computers. No sign-up, no email and no ads between questions.
Does it work on a phone or tablet?
Yes. It is built for touch first, and every game can also be played by tapping an answer or pressing 1, 2 or 3 on a keyboard. Tap the full-screen button for the best fit.
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