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Add 21/70 and 15/80

21/70 + 15/80 is 39/80.

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,
    21/70 = 21 × 8/70 × 8 = 168/560
  3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
    15/80 = 15 × 7/80 × 7 = 105/560
  4. Add the two like fractions:
    168/560 + 105/560 = 168 + 105/560 = 273/560
  5. 273/560 simplified gives 39/80
  6. So, 21/70 + 15/80 = 39/80

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