50 − 40 = ?, 10, 20, 40, 90, Forty plus sixty = ?, 80, 90, 100, 70, 70 − 50 = ?, 10, 20, 30, 50, Twenty plus seventy = ?, 80, 60, 90, 100, 80 − 30 = ?, 60, 40, 50, 70, Ten plus thirty = ?, 20, 40, 60, 30, 90 − 20 = ?, 60, 70, 80, 50, Thirty plus fifty = ?, 70, 80, 90, 60.

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