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Add 21/24 and 30/40

21/24 + 30/40 is 13/8.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 24 and 40 is 120

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 24 × 5 = 120,
    21/24 = 21 × 5/24 × 5 = 105/120
  3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
    30/40 = 30 × 3/40 × 3 = 90/120
  4. Add the two like fractions:
    105/120 + 90/120 = 105 + 90/120 = 195/120
  5. 195/120 simplified gives 13/8
  6. So, 21/24 + 30/40 = 13/8
    In mixed form: 15/8

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