Solutions by everydaycalculation.com

670 + 456 is 1170.

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

LCM of 70 and 56 is**280**

Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,

670 = 6 × 470 × 4 = 24280 - Likewise, for the 2nd fraction, since 56 × 5 = 280,

456 = 4 × 556 × 5 = 20280 - Add the two like fractions:

24280 + 20280 = 24 + 20280 = 44280 - 44/280 simplified gives 1170
- So, 6/70 + 4/56 = 11/70

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