Addition: altogether, combined , sum, total, plus, both, together, more, in all, add, Subtraction: difference, how many more, left over, less than, subtract, take away, fewer, remain, reduce, minus, how much (longer, shorter, heavier, lighter etc.), Multiplication: times, product of, double, twice, groups of, by (L X W, LXWXH etc.), factor of, multiplied by, Division: each, quotient, shared equally, split, groups, separated, equal groups, parts, per, how many in each,

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