Maths on the Back of an Envelope: Clever ways to (roughly) calculate anything by Rob Eastaway, 9780008324582 2019-09-03

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Nursery Numbers Book 4 by Sally Johnson, 9780721708706 2000-10-01

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Mental Arithmetic 4 by J. W. Adams, 9780721708027 2016-01-01

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Mental Arithmetic 5 by T. R. Goddard, 9780721708034 2016-01-01

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Mental Arithmetic 3 by T. R. Goddard, 9780721708010 2016-01-01

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First Mental Arithmetic Book 4 by Ann Montague-Smith, 9780721711669 2016-01-01

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Mental Arithmetic 6 Answers: No. 6 by Lynn Spavin, 9780721708102 2016-01-01

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First Mental Arithmetic: Book 2 by Ann Montague-Smith, 9780721711645 2016-01-01

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First Mental Arithmetic Book 5 by Ann Montague-Smith, 9780721711676 2016-01-01

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First Mental Arithmetic Book 6 by Ann Montague-Smith, 9780721711683 2016-01-01

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Mental Arithmetic 1 Answers by J. W. Adams, 9780721708058 2016-01-01

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First Mental Arithmetic Book 3 by Ann Montague-Smith, 9780721711652 2016-01-01

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Mental Arithmetic 1 by J. W. Adams, 9780721707990 2016-01-01

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Mental Arithmetic 2 by J. W. Adams, 9780721708003 2016-01-01

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Mental Arithmetic 3 Answers by J. W. Adams, 9780721708072 2016-01-01

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The Trachtenberg Speed System of Basic Mathematics by Jakow Trachtenberg, 9780285629165 1989-06-29

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Mental Arithmetic 5 Answers by J. W. Adams, 9780721708096 2016-01-01

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Mental Arithmetic 4 Answers by J. W. Adams, 9780721708089 2016-01-01

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Number Book 1 by Andrew Parker, 9780721707884 2000-04-00

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Mental Arithmetic Introductory Book by Lynn Spavin, 9780721707983 2016-01-01

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First Mental Arithmetic Answer Book 5 by Ann Montague-Smith, 9780721711737 2016-01-01

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Times Tables Tests Book 2 by Hilary Koll, 9780721711362 2017-01-01

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Mental Arithmetic 6 by Edmund Spavin, 9780721708041 2016-01-01

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Mental Arithmetic 2 Answers by J. W. Adams, 9780721708065 2016-01-01

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First Mental Arithmetic: Book 1 by Ann Montague-Smith, 9780721711638 2016-01-01

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Maths on the Back of an Envelope: Clever ways to (roughly) calculate anything by Rob Eastaway, 9780008444495 

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Learn Your Times Tables: Part 2 by Hilary Koll, 9780721711294 2007-11-30

Mental Maths Book 1 by Sally Johnson, 9780721709628 2004-03-01

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Mental Maths Book 2 by Sally Johnson, 9780721709635 2004-03-01

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Help Your Kids With Times Tables by Carol Vorderman, 9780241317013 2017-08-03

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