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Add 21/12 and 28/40

1st number: 1 9/12, 2nd number: 28/40

21/12 + 28/40 is 49/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 40 is 120

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 12 × 10 = 120,
    21/12 = 21 × 10/12 × 10 = 210/120
  3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
    28/40 = 28 × 3/40 × 3 = 84/120
  4. Add the two like fractions:
    210/120 + 84/120 = 210 + 84/120 = 294/120
  5. 294/120 simplified gives 49/20
  6. So, 21/12 + 28/40 = 49/20
    In mixed form: 29/20

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