45 + 20 = - 75, 67 + 30 = - 97, 36 + 50 - 86, 28 + 40 = - 68, 89 - 70 = - 29, 78 - 60 = - 18, 83 - 50 = - 33, 29 - 10 = - 19,

Adding/Subtracting Multiples of Ten

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