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Add 15/21 and 12/20

15/21 + 12/20 is 46/35.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 21 × 20 = 420,
    15/21 = 15 × 20/21 × 20 = 300/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    12/20 = 12 × 21/20 × 21 = 252/420
  4. Add the two like fractions:
    300/420 + 252/420 = 300 + 252/420 = 552/420
  5. 552/420 simplified gives 46/35
  6. So, 15/21 + 12/20 = 46/35
    In mixed form: 111/35

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