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7/8 + 3/5 = 35/40 + 24/40 = 59/40 or 1 19/40
3/8 and 1/5 or 15/40 and 8/40, hence 3/8 is greater than 1/5
The least common denominator (LCD) is 40.
1 and 3/8ths is the same as 8/8ths + 3/8ths. This is summed to 11/8ths. Half of that would be 11/16ths.
42/8, or 5 and 1 fourth