ChocoJuegosMental arithmetic games
Practice sums, making change, comparisons and operation chains in four number games.
Play freeNo download · Browser · Mobile and desktop
Solve sums, coin change, calculation comparisons and targets with limited operations.
You want to do calculations within small problems with a visible goal.
Start with The Right Sum.
In the operation-chain mode, the step limit still applies when playing without a timer.
Pace: Calm pace has no timer; the timed pace adds time pressure.
If the task asks for two tiles totaling 10 and tiles of 6 and 4 are available, try that pair and check. Your choice depends on the tiles in your challenge.
Combine numbers, give change, compare calculations or reach a number in a few steps. No calculator, always another chance.
Choose exactly the requested number of tiles to reach the target sum.
Work out how far you are from the target first. For operation chains, also reason backward from the result to narrow down the options.
Tab Enter: choose
Tap the options. Use arrow keys on boards when playing with a keyboard.
Choose the tiles needed to add up to the target.
Choose exactly the requested number of tiles to reach the target sum.
Tap a selected tile to remove it, then check the sum.
Scoring: 100 per challenge solved + 25 per level − 10 per mistake − 15 per hint. Never below zero. No timer or attempt limit.
Return the exact amount using the available coins.
Subtract the price from the amount you received.
Tap coins until you have the exact change. You can repeat coins or undo.
Scoring: 100 per challenge solved + 25 per level − 10 per mistake − 15 per hint. Never below zero. No timer or attempt limit.
Compare the calculations: which is larger, or are they equal?
Work out both calculations and compare the results.
Choose left, right or equal.
Scoring: 100 per challenge solved + 25 per level − 10 per mistake − 15 per hint. Never below zero. No timer or attempt limit.
Use the operations to reach the target within the step limit.
Plan which operations take you from the current number to the target.
Stay within the available steps. You can undo and try another route.
Scoring: 100 per challenge solved + 25 per level − 10 per mistake − 15 per hint. Never below zero. No timer or attempt limit.
This is a single-player game. Practice and improve your own score.
We compare game rules and controls. Stated times are mode limits, not average durations. Recommendations are editorial. How we prepare these facts.