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Practice your mental math and logic skills with these unique puzzle books. Each puzzle requires you to fit a set of numbers into a pattern, such as a diamond, star, or overlapping circles. However, the arrangement of the numbers has to conform to each puzzle's rule. For example, one puzzle requires you to arrange the numbers one through six into a triangle so that the sum of the three numbers on each side is the same. Each book contains a total of 96 puzzles. Reproducible. 56 pgs, pb. ~ Lisa
