13 over 8 plus 12 over 3, I'm assuming?
Well first, you need to find a common denominator... multiply 8 x 3. This gets 24. This is your denominator for both sides.
Multiply the numerator of one of these by the denominator of the other. So 13(3) = 39 and 12(8) = 96. Add these together: 39 + 96 = 135. Put this over your common denominator, 24. 135/24. Simplify. 5 5/8.
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It is: 1/3 plus 1/3 = 2/3
((2 plus (1 over 4)) plus 3) plus (7 over 8) = 6.12500
1
2/5 plus 1/3 plus 5/6 is equal to 1.57 or 1 57/100
2/3 + 1/4 + 2/3 = 4/3 + 1/4 = (16/12) + (3/12) = 19/12 = 1 and 7/12