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Add 21/28 and 6/20

21/28 + 6/20 is 21/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 20 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 28 × 5 = 140,
    21/28 = 21 × 5/28 × 5 = 105/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    6/20 = 6 × 7/20 × 7 = 42/140
  4. Add the two like fractions:
    105/140 + 42/140 = 105 + 42/140 = 147/140
  5. 147/140 simplified gives 21/20
  6. So, 21/28 + 6/20 = 21/20
    In mixed form: 11/20

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