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This is a screenshot guide to Kalkulko, an arithmetic practice app from Yellow Bench.

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The examples include earlier English screens and Czech simulator screenshots, explained here in English.

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This setup example selects 10 questions, numbers up to 20, and addition and subtraction.

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You can choose a different question count, range, or operation group for another round.

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Ordinary rounds are timed.

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This English game screen shows the timer, question counter, and keypad.

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The saved example coming next contains one incorrect answer.

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Completed games can be reviewed in game history.

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The app stores the last 50 completed games on this device,

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including recorded answers and correct solutions.

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Here is a Czech example from September 8th.

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17 plus 2 was answered as 20.

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The detail preserves that answer and shows 19

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as the correct result.

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The mistakes filter is enabled.

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The highlighted action means practice mistakes from this game.

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It starts a separate round without a timer or leaderboard.

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Each saved mistake appears once.

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The original answers remain in the original record.

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This saved practice result shows one correct answer out of one.

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It has no elapsed time or leaderboard score.

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The active practice screen is not shown in this guide.

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Kalkulko is free and ad-free.

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The official Android and iPhone download links are in the description.

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Choose a short round, then use the saved answers for review.