Math Chain — Free Running-Total Mental Math Game

Follow a chain of operations. Type the result.

Mental math
3 min
Medium

Math Chain starts with a number, then feeds you operations one at a time: +7, ×3, −12. Nothing is written down and nothing stays on screen. You are updating a single value under time pressure, which is the same executive process Serial Addition trains — just wearing arithmetic clothes.

Math Chain is free with a HumanCalc account

Follow a chain of operations. Type the result. Make a free account in about 10 seconds (Google, one tap) and start playing right away. New accounts get a one-time +500 XP welcome bonus, and your scores, XP and streak are kept on every device.

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How it works

1A starting number flashes, then disappears.

2Operations arrive one at a time. Apply each as it lands.

3Type the final total. Nothing stays on screen.

How to play

1
Note the starting number
A number flashes briefly. That is your starting total.
2
Apply each operation
Operations appear one at a time — +, −, × or ÷. Apply each to your running total as it arrives.
3
Type the final total
When the chain ends, enter the result. Longer chains and faster steps come with each level.

What it trains

Compute fast without writing anything down. Maintaining and revising a single running value is the updating component of executive function, separable from inhibition and task switching.

Practice focus: Mental math
Based on: Miyake et al., 2000