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Sum and Subtract Game - Moadly: Free Brain Training Web/iOS/Android Memory Game

Sum and Subtract

Sum green and subtract red numbers before timer runs out.

How to play Sum and Subtract?

4 online

GentleFancy906

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SwiftFalcon983

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Dakuio PRO

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PumaFancy17

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GentleBear662

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1d ago

JollyPlucky775

22 total points

1d ago

Sum and Subtract is a free brain web game that tests your mental arithmetic through color-coded logic. Numbers flash on the screen in two colors: green numbers are added to your total, while red numbers must be subtracted. You have 20 seconds to process the sequence and submit the final result.

I designed this as a switching-cost drill. Most math games just ask you to add, but this forces your brain to constantly flip between addition and subtraction without losing your place. If you make a mistake or run out of time, the round ends. As you advance, more numbers appear and the complexity increases, making it a direct way to check your calculation speed and focus.

Sharpen Mental Arithmetic and Switching Speed

Name: Sum and Subtract by Moadly
Rating: 4.5 (67 reviews)
Author: Moadly

The challenge is staying accurate while the clock is ticking. You have to keep a "rolling total" in your head as the colors change, which builds the kind of mental agility needed for real-world calculations. It’s a straightforward, effective way to see how fast your brain can process basic operators under pressure.

Why Play Sum and Subtract?

It trains rapid mental math and numerical accuracy.
It improves cognitive flexibility by switching between operators.
Short, 20-second rounds make it easy to squeeze in a mental workout.
It runs instantly in your browser with no setup or downloads.

"My go-to math game! I love racing the clock and testing my mental math skills."

- CalcMaster

"Tests focus and arithmetic speed perfectly. Each level gets noticeably more challenging."

- SpeedySolver

The interface is minimal to keep your attention on the colors and numbers. Success depends on your ability to stay calm and keep your count precise as the sequence gets longer. Sum and Subtract is available anytime in your browser for a fast-paced mental challenge.

Brain Games

Memory

Focus & Clarity

All Ages

Disclaimer: We cannot guarantee that the games will improve brain function, prevent or cure memory loss, or any other condition. Nothing in app is medical advice and reflects personal, subjective experiences only. Treat the app as a game.