40 - 20 = ?, 20, 30, 25, 40 - 15 = ?, 15, 25, 35, 40 - 11 = ?, 29, 25, 19, 40 - 25 = ?, 15, 25, 20, 40 - 30 = ?, 20, 10, 15

Subtraction with 40

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