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(1/10 + 1 3/5 - 13/20 + 2 3/8)*80 = 274 1. 1/10 + 1 3/5 = 1/10 + 1 6/10 = 1 7/10 2. 1 7/10 - 13/20 = 34/20 - 13/20 = 21/20 3. 21/20 + 2 3/8 = 21/20 + 19/8 = 42/40 + 95/40 = 137/40 4. 137/40 * 80 = 137*2 = 274