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Add 18/20 and 25/28

18/20 + 25/28 is 251/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 28 is 140
  2. For the 1st fraction, since 20 × 7 = 140,
    18/20 = 18 × 7/20 × 7 = 126/140
  3. Likewise, for the 2nd fraction, since 28 × 5 = 140,
    25/28 = 25 × 5/28 × 5 = 125/140
  4. Add the two fractions:
    126/140 + 125/140 = 126 + 125/140 = 251/140
  5. In mixed form: 1111/140

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