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The Trachtenberg Speed System of Basic Mathematics
pocket,
1989,
Engelsk,
ISBN 9780285629165
Do high-speed, complicated arithmetic in your head using the Trachtenberg Speed System. Ever find yourself struggling to check a bill or a payslip? With The Trachtenberg Speed …
Trachtenberg Speed System of Basic Mathematics
e-bok,
2011,
Engelsk,
ISBN 9780285639959
Do high-speed, complicated arithmetic in your head using the Trachtenberg Speed System. Ever find yourself struggling to check a bill or a payslip? With The Trachtenberg Speed …