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Add 20/21 and 21/28

20/21 + 21/28 is 143/84.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 28 is 84
  2. For the 1st fraction, since 21 × 4 = 84,
    20/21 = 20 × 4/21 × 4 = 80/84
  3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
    21/28 = 21 × 3/28 × 3 = 63/84
  4. Add the two fractions:
    80/84 + 63/84 = 80 + 63/84 = 143/84
  5. In mixed form: 159/84

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