Speed Mathematics: Secret Skills for Quick Calculation by Bill Handley
£7.49
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The Trachtenberg Speed System of Basic Mathematics by Jakow Trachtenberg
£5.99
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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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Speed Mathematics Simplified (Dover Science Books) by Edward Stoddard
£9.99
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Rapid Math Tricks and Tips: Thirty Days to Number Power by Edward H. Julius
£6.99
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