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Add 21/15 and 28/40

1st number: 1 6/15, 2nd number: 28/40

21/15 + 28/40 is 21/10.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 40 is 120

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 15 × 8 = 120,
    21/15 = 21 × 8/15 × 8 = 168/120
  3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
    28/40 = 28 × 3/40 × 3 = 84/120
  4. Add the two like fractions:
    168/120 + 84/120 = 168 + 84/120 = 252/120
  5. 252/120 simplified gives 21/10
  6. So, 21/15 + 28/40 = 21/10
    In mixed form: 21/10

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