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= 74 5/6
2) 5/8 + 1/10 = 25/40 + 4/40
= 29/40
3) 5 1/2 + 6 2/3 + 8 1/4 = 5 6/12 + 6 8/12 + 8 3/12
= 19 17/12
= 20 5/12
4) 21 1/2 - 7 3/10 - 6 3/8 = 21 20/40 - 7 12/40 - 6 15/40
= 20 60/40 - 7 12/40 - 6 15/40
= 7 33/40
5) 1 - 4/15 = 15/15 - 4/15
= 11/15