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Just like Timed Math Drills, these 28-page drill books systematically practice facts from 0 to 9. The drills even follow the same step-by-step progression of difficulty. At first, just one addend/subtrahend/factor/divisor is practiced. Then, two or three are mixed on a drill, and finally, all facts are practiced together. The drills are "easy" because they only present 36 problems per page as opposed to 100. Problems are presented in both columnar and horizontal format on each drill. ~ Anh
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