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3-12 year olds, 4-, 4-12 year olds, 40s, African American, Togalese-American, USA, addition, adult, age 40, aids, black, boy, child, counters, cubes, female, flash cards, forties, hands-on, home, homework, horizontal, human, male, manipulatives, math, mathematics, mother, parent, physical, two people, woman