Mental Arithmetic — Free Mental Math Practice Online

Multi-step problems, nothing but your head.

Mental math
4 min
Medium

Practise mental arithmetic with timed addition, subtraction, multiplication and division. HumanCalc's eight levels progress from small sums to expressions with parentheses. Use the on-screen keypad or keyboard, check your answers and find a pace you can sustain without a calculator.

Play Mental Arithmetic

How it works

1A multi-step expression appears.

2Work it left to right, holding the middle result.

3Type the answer on the keypad.

How to play

1
Read the problem
An arithmetic expression appears. Early levels are two terms; later ones chain three or more operations.
2
Solve it in your head
Solve without a calculator. Follow parentheses and the usual order of operations: multiplication and division before addition and subtraction.
3
Type your answer
Use the on-screen keypad. Correct answers push the level up, wrong ones cost a life.

What it trains

Compute fast without writing anything down. Working-memory research describes holding information while processing it. Mental arithmetic uses both calculation and intermediate results; the original model does not validate this browser game's training benefits.

Practice focus: Mental math
Based on: Baddeley & Hitch, 1974

Research background

Baddeley & Hitch (1974): Working Memory

These sources describe related tasks or concepts. HumanCalc adapts them for browser practice; a game score is not a clinical result.

Leaderboard

Weekly season resets every Monday. Scores show as Lvl 5.

Leaderboard

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Questions

Are the problems timed?

Yes. The answer window runs from 15 seconds at level 1 to 7 seconds at level 8. Three consecutive correct answers move you up a level.

Can I use paper?

You can use paper when learning a technique, then try a round without it. The game is designed for mental calculation rather than written computation.

Which level is average?

HumanCalc does not publish a verified average. Compare your accuracy at the same level over time, and choose a level that lets you practise rather than repeatedly run out of time.