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Essential pre-school series: port operator simple calculation speed calculation mental arithmetic (addition and subtraction within 10)(Chinese Edition)

paperback. Condición: New. Pub Date: 2014-07-01 Pages: 80 Language: Chinese Publisher: China Population Press port operator mental arithmetic speed calculation simple calculation is to enhance the computing capability of pre-school children written. To 10.20.50.100 for boundaries. respectively. do not carry not abdicate abdication contact binary addition and subtraction. and the children's special exercises comprehensive. systematic. let the children repeated practice to enhance memory. improve computing speed. master . Nº de ref. del artículo: BZ030125

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