Solutions by everydaycalculation.com

17 + 28 is 1128.

- Find the least common denominator or LCM of the two denominators:

LCM of 7 and 8 is**56**

Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 7 × 8 = 56,

17 = 1 × 87 × 8 = 856 - Likewise, for the 2nd fraction, since 8 × 7 = 56,

28 = 2 × 78 × 7 = 1456 - Add the two like fractions:

856 + 1456 = 8 + 1456 = 2256 - 22/56 simplified gives 1128
- So, 1/7 + 2/8 = 11/28

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