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13/24+77/12
= 13/24 + 144/24 =157/24
7/6 -5/12
= 14/12 -5/12 = 9/12
-31/4-2/3
= - 93/12 - 8/12
= 101/12
5- 7/10
= 50/10 -7/10 = 43/10
1/8-5/3
= 3/24 - 40/24= -37/24
3/2-4/5
= 15/10 - 8/10 = 7/10
We need LCM of denominators
LCM=24
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