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About
Created by a Math Teacher
Train your brain in just 30 seconds.
QuickMath Series
A fast and fun way to master mental math.
Can you find the right number pairs?
Use both positive and negative numbers
to reach the target.
Example:
(-2) + (-4) = -6
(-4) + (+5) = 1
Challenge yourself and improve:
• Negative number understanding
• Mental calculation speed
• Focus and thinking skills
From upper elementary to middle school level.
QuickMath Series
• SumX – Number Pair Puzzle
• SumXMinus – Negative Number Training
• Common Divisor – Divisor Brain Training
• Exponent – Power Calculation Challenge
• Decimal Finder – Number Line Intuition
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What's New in SumXMinus
2.1.1
June 23, 2026
Improved the Result View layout on certain tablet devices, including the iPad Air 11-inch. * Fixed layout issues on the result screen * Improved visibility of scores and buttons * Enhanced overall user experience
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