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10. 2 2/3 + 1 3/4 + 7/8 = (2+1) 16/24 + 18/24 + 21/24 = 3 55/24 = 5 7/24

11. 7 2/3 + 3 3/10 - 1 3/4 = (7+3-1) 40/60 + 18/60 - 45/60 = 9 3/20

12. 7/8 - 3/8 = 4/8 : 2 = 8/4 × 1/2 = 4/4 = 1

13. 10/12 × 1 3/8 = 10/12 × 11/8 = 110/96 = 1 14/24 = 1 7/12