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paperback. Condition: New. Language:Chinese.Paperback. Pub Date: 2016-12-01 Pages: 76 Publisher: jiangsu phoenix publishing house of science and technology This book of the initial phase of count. size. number. unit conversion to late are all included in the calculation of multibit addition. subtraction. multiplication. and division of scope. mainly mental arithmetic. oral. fast. and set up some oral skills. formula. teach students oral arithmetic. the method and skill of simplified. culture.