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Add 8/20 and 21/63

8/20 + 21/63 is 11/15.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 63 is 1260

    Next, find the equivalent fraction of both fractional numbers with denominator 1260
  2. For the 1st fraction, since 20 × 63 = 1260,
    8/20 = 8 × 63/20 × 63 = 504/1260
  3. Likewise, for the 2nd fraction, since 63 × 20 = 1260,
    21/63 = 21 × 20/63 × 20 = 420/1260
  4. Add the two like fractions:
    504/1260 + 420/1260 = 504 + 420/1260 = 924/1260
  5. 924/1260 simplified gives 11/15
  6. So, 8/20 + 21/63 = 11/15

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