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By Josh Rappaport Put an end to student confusion about positive and negative numbers and watch them suddenly start doing better in pre-algebra and algebra in general. Students learn the rules for combining integers by working with interlocking foam manipulatives. Book includes 70 foam manipulatives, hundreds of practice problems with answers in the back, 16 page comic book, two board games and teaching guide. Reproducible. Grades 3-8. 128 pages. | 
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