1/8 + 2/4= 1/8 + 4/8
= 5/8
=0.625
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The sum of those fractions is 9 over 10 or 9/10.
1.5 or 1 + 1 over 2
The sum of 1/8 and 3/8 is 1/2
2 over 8
The sequence of numbers is 2n where n goes from 1 to 5 Now sum (over n=1 to 5) of 2n = 2*sum (over n=1 to 5) of n = 2 * [5*(5+1)]/2 = 5*6 = 30