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Add 20/28 and 21/30

20/28 + 21/30 is 99/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 30 is 420
  2. For the 1st fraction, since 28 × 15 = 420,
    20/28 = 20 × 15/28 × 15 = 300/420
  3. Likewise, for the 2nd fraction, since 30 × 14 = 420,
    21/30 = 21 × 14/30 × 14 = 294/420
  4. Add the two fractions:
    300/420 + 294/420 = 300 + 294/420 = 594/420
  5. After reducing the fraction, the answer is 99/70
  6. In mixed form: 129/70

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