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Add 21/28 and 4/20

21/28 + 4/20 is 19/20.

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,
    4/20 = 4 × 7/20 × 7 = 28/140
  4. Add the two like fractions:
    105/140 + 28/140 = 105 + 28/140 = 133/140
  5. 133/140 simplified gives 19/20
  6. So, 21/28 + 4/20 = 19/20

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