Super-quick Adding and Subtracting in Your Head (30 Second Challenge S.)

by Norman Lock

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As a result of media and parental attention to need for improvement of core skills, this is a fast-paced mental arithmetic book to encourage mastery of two of the four rules of number.

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As a result of media and parental attention to need for improvement of core skills, this is a fast-paced mental arithmetic book to encourage mastery of two of the four rules of number.

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