Add up the Flashing Numbers - Test your Mental Math (Imaginary Abacus) Skills !
- Extension Formulae to include/exclude
- Number of Values to choose from
- Number of Digits to choose from
- Flash time (speed) can be changed from 2.0 to 0.4 seconds
- Beep sounds on each flash (can be turned on/off)
- Large sized Font on Black background for best visualization of numbers
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