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Add 15/20 and 21/63

15/20 + 21/63 is 13/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 63 is 1260
  2. For the 1st fraction, since 20 × 63 = 1260,
    15/20 = 15 × 63/20 × 63 = 945/1260
  3. Likewise, for the 2nd fraction, since 63 × 20 = 1260,
    21/63 = 21 × 20/63 × 20 = 420/1260
  4. Add the two fractions:
    945/1260 + 420/1260 = 945 + 420/1260 = 1365/1260
  5. 1365/1260 simplified gives 13/12
  6. So, 15/20 + 21/63 = 13/12
    In mixed form: 11/12

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