Seven eights plus three eights is ten eights. Now, possibly you intended to ask about eighths, rather than eights. Ten eighths is equal to one and a quarter. However, ten eights is equal to 80. The extra h makes a difference.
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It would be 13/8 or 1 and 5/8
The final answer would be three and three-eighths. Here's how to solve it mentally.You have to set their denominators [bottom numbers] equal. So, keep seven eights, since two ["half"] goes into eight, but you must make 2 and a half into 2 and four eights, because four is half of eight. Pretend for a minute that the four eights isn't there. So, 2 and seven eights. Then, add one from the four eights, so that it will now be 3., and so that the four eights is now three eights. So, 3 and three eights.Sorry. I'm not very good at explaining, but I hope that helped. ^^"
11 and 31 over 40
Half of seven eights is three fourths
7/24