Mondo Knows Games
Tens and Ones
Two-digit numbers plus ten, twenty, thirty and so on. It is the first arithmetic game in the arcade and the only one with no penalty beyond a two-second nudge.
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How to play
- Press Start to see the first sum.
- Add the tens in your head.
- Type the answer and press OK.
- A wrong answer costs two seconds.
Controls
Tap the keypad, or type digits and press Enter.
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Questions people ask
- How do you play Tens and Ones?
- Press Start to see the first sum. Add the tens in your head. Type the answer and press OK. Tap the keypad, or type digits and press Enter.
- Is Tens and Ones free to play?
- Yes. Tens and Ones runs in the browser for nothing: no download, no account and no sign-up. Tens and Ones sits on the Kids & Family shelf at Mondo Knows, alongside addition and place value games.
- How long does a game of Tens and Ones take?
- 1 minute. It is rated easy, and tap the keypad, or type digits and press Enter. Your best score stays on your own device.
- Does Tens and Ones work on a phone?
- Yes. The board sizes itself to the screen, so Tens and Ones plays the same on a phone as on a desktop, and touch controls replace the mouse. Nothing needs installing.
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Everything runs in your browser. Scores and bests are stored on your own device, not on a server.