twenty + ten = __________________, 30, fifty − twenty = __________________, 30, thirty + twenty = __________________, 50, eighty − thirty = __________________, 50, forty + thirty = __________________, 70, ninety − twenty = __________________, 70, sixty − forty = __________________, 20, twenty + fifty = __________________, 70, seventy − thirty = __________________, 40, forty + forty = __________________, 80

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