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Add 15/60 and 21/63

15/60 + 21/63 is 7/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 60 and 63 is 1260
  2. For the 1st fraction, since 60 × 21 = 1260,
    15/60 = 15 × 21/60 × 21 = 315/1260
  3. Likewise, for the 2nd fraction, since 63 × 20 = 1260,
    21/63 = 21 × 20/63 × 20 = 420/1260
  4. Add the two fractions:
    315/1260 + 420/1260 = 315 + 420/1260 = 735/1260
  5. After reducing the fraction, the answer is 7/12

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