5/8 + 3/10
need common denominator to add fractions, 40 looks right here and then need a form of one multiplier to get fraction to common denominator
5*5/5*8 + 4*3/4*10
25/40 + 12/40
= 37/40
-------------simplest form
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1 11/40
11 and 31 over 40
one and five tenths or one and a half
one and three eights
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.