Speed Mathematics: Secret Skills for Quick Calculation by Bill Handley
£7.49
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Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Mental Math Tricks by Michael Shermer
£6.99
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Math Magic for Your Kids by Scott Flansburg
£8.06
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The Trachtenberg Speed System of Basic Mathematics by Jakow Trachtenberg
£5.99
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Arithmetricks: 50 Easy Ways to Add, Subtract, Multiply and Divide Without a Calculator by Edward H. Julius
£5.49
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