7 + 8 = ?, ten, fifteen, eleven, thirteen, 9 + 19 = ?, eighteen, twenty-six, thirty-two, twenty-eight, 24 + 36 = ?, fifty-eight, sixty, sixty-two, seventy, 21 - 7 = ?, fourteen, eleven, ten, twelve, 3 x 4 = ?, twelve, seventeen, seven, one, 4 x 20 = ?, twenty-four, thirty-six, eighty, sixteen, 12 - 3 = ?, six, nine, fifteen, seven, 99 / 11 = ?, nine, nineteen, one, ten, 99 - 33 = ?, sixty-three, fifty-six, sixty-six, thirty-three, 44 / 1 = ?, fourty-three, thirty-three, fourty-four, twelve, 54 - 13 = ?, thirty-seven, twenty-nine, seventy-seven, fourty-one, 91 / 7 = ?, thirteen, twenty-six, ninety-eight, twelve.

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