mental maths

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Mental Math Kids Can't Resist!: Tips, Short-cut Strategies, and 60 Fun Practice Pages That Reinforce Essential Math Skills and B
Mental Math Kids Can't Resist!: Tips, Short-cut Strategies, and 60 Fun Practice Pages That Reinforce Essential Math Skills and B
Richard S Piccirilli
Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks
Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks
Arthur Benjamin Michael Shermer