Online math game

True or false: is the problem solved correctly?

Also known as: true or false math problems, check the math problem, find the mistake in a math problem, quick math checking game

You see a problem with a ready answer, for example 7 + 5 = 13. Press “True” or “False” before the time for the answer runs out. A round lasts one minute, and you can play 10 minutes a day without signing up.

Go to the game ↓
  • 1 minuteper round
  • 4 levelsfrom addition to parentheses
  • No sign-up10 minutes a day
  • Progress30-day chart
What it trains

Why check someone else’s math

Checking an answer is faster than solving the problem, but only if you calculate confidently. The wrong answers here look real: off by one or by ten, with swapped digits, with a mixed-up sign, or worked out ignoring the parentheses. You can’t tell just by looking.

The time for each problem gets shorter with every correct answer, so by the end of the minute you have to calculate faster. Once you sign up, your account shows your score, correct answers, mistakes and top level.

  • You check change and bills by eyeHere you have to check quickly and accurately
  • You mix up the order of operationsLevel 4 has parentheses traps
  • You want a short math warm-upOne minute per round
  • Your child is learning addition and subtractionFor kids, problems stay within 100

Mental math

Addition, subtraction, multiplication and division facts.

Decision speed

The time per answer shrinks with every correct answer.

Attention to detail

The mistake can be in a single digit or in the sign.

Order of operations

Parentheses first, then multiplication and division.

Rules

How to play

  1. Start

    Press “Start”. A problem with an answer appears, for example 7 + 5 = 13.

  2. Answer

    Press “True” if the answer is right or “False” if it isn’t. On a computer the ← and → keys work too.

  3. Time

    The bar under the problem shows how much time you have left to answer. If you run out, the problem disappears and no points are taken.

  4. Level

    Three correct answers in a row take you up a level: addition and subtraction up to 20, then up to 100, multiplication and division facts, then problems with parentheses.

  5. Score

    A correct answer earns as many points as your current level, and a mistake takes the same amount away. Two mistakes in a row lower the level.

Play online

True or false online

Check math problems against the clock. Without sign-up you get 10 minutes of play a day.

True or False

A problem with an answer appears on the screen. Decide whether it’s right before time runs out. The wrong answers look convincing, and the time to answer keeps shrinking.

Free play left today without signing up: 10 min

Method

What the exercise is based on

This is a checking task, not a solving one: you quickly compare your own calculation with a given answer. Wrong answers are built from typical mental math mistakes: the next number over, an error of ten, swapped digits, a mixed-up sign, forgotten parentheses. Right and wrong problems come up equally often.

If you’d rather calculate than check, try “Quick Math”. “Greater or Less” has you compare the values of expressions, and “Balance” offers equality puzzles.

1–2Addition and subtractionUp to 20, then up to 100
3TablesMultiplication and division within the times tables
4ParenthesesMixed problems and order of operations
Who it’s for

Which ages

Adults

A one-minute mental math warm-up: from simple problems to parentheses.

Kids

Suitable from age 6: for kids there’s only addition and subtraction up to 100, and more time to answer.

60+

The time to answer is generous at first, and skipping a problem costs no points.

Program finder

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Answer 4 questions and we’ll put together a daily program of 5 trainers. We’ll email you the full 2-week plan.

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Questions

Frequently asked questions

What happens if I don’t answer in time?

The problem counts as skipped: no points are taken, but your streak of correct answers resets, and we show the right answer.

Why do mistakes cost points?

So you can’t score by tapping at random: random taps average out to zero.

How often is the answer correct?

In about half of the problems. Answers are chosen at random, so you can’t predict them from earlier problems.

Do I need to sign up?

No, you can play 10 minutes a day right away. Free sign-up lets you keep playing, save your results, track your progress and unlock the daily workout.

Does it work on a phone?

Yes, the game runs in the browser on a phone, tablet or computer. There’s nothing to install.

Save your results and track your progress

Free sign-up: round history, a chart by skill and a daily workout of 5 exercises. No credit card needed.

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