Answers

Add 27/70 and 42/80

27/70 + 42/80 is 51/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 80 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 70 × 8 = 560,
   27/70 = 27 × 8/70 × 8 = 216/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   42/80 = 42 × 7/80 × 7 = 294/560
4. Add the two like fractions:
   216/560 + 294/560 = 216 + 294/560 = 510/560
5. 510/560 simplified gives 51/56
6. So, 27/70 + 42/80 = 51/56

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