You must convert the fractions to equivalent fractions with a common denominator, which in this case is 20.
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1/8 + 2/4= 1/8 + 4/8 = 5/8 =0.625
The probability of rolling a sum of 5 with two die is 4 over 36, or 2 over 18, or 1 over 9.
The sum of 4/5 and 1/2 is 1 3/10
A sum of 4 is more likely. Out of the 36 possible outcomes with a pair of 6-sided dice, only one will have a sum of 2 {1-1}. Three of the possibilities sum to 4. {1-3, 2-2, 3-1}
1/14 + 5/14 + 2/14 = (1+5+2)/14 = 8/14 = 4/7