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Add 15/20 and 8/21

15/20 + 8/21 is 95/84.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 21 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 20 × 21 = 420,
    15/20 = 15 × 21/20 × 21 = 315/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    8/21 = 8 × 20/21 × 20 = 160/420
  4. Add the two like fractions:
    315/420 + 160/420 = 315 + 160/420 = 475/420
  5. 475/420 simplified gives 95/84
  6. So, 15/20 + 8/21 = 95/84
    In mixed form: 111/84

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