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Add 21/28 and 18/5

1st number: 21/28, 2nd number: 3 3/5

21/28 + 18/5 is 87/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 5 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 5 × 28 = 140,
    18/5 = 18 × 28/5 × 28 = 504/140
  4. Add the two like fractions:
    105/140 + 504/140 = 105 + 504/140 = 609/140
  5. 609/140 simplified gives 87/20
  6. So, 21/28 + 18/5 = 87/20
    In mixed form: 47/20

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