APK4Fun collected total 2 versions for Mental Math APK (ink.hue.pme). You could download one of the legacy or old version of it.
Mental Math App Version History
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Mental Math v2.9 APK (Latest Version APK)
► Updated: December 25, 2018
► What's New in Version 2.9:
Bug Fixes.
Performance Improved.
Optimized for Android Pie. -
Mental Math v2.8 APK (Old Version APK)
► Updated: July 22, 2018
► What's New in Version 2.8:
Math Book Added
Math Tool Bug Fixes