7/8 + 9/10 Easy in decimal, .875 + .9 = 1.775
35/40 + 36/40 = 71/40 = 1 and 31/40
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The sum of 7/10 and 4/15 = 29/30
The sum of -10 and -7 is -17.
7 over 10 plus 7 over 10 is 14 over 10 or 1.4
7/10 + 7/10 = 7/5
It is 9/8 plus 7/3 = 83/24