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Add 4/12 and 21/40

4/12 + 21/40 is 103/120.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 40 is 120
  2. For the 1st fraction, since 12 × 10 = 120,
    4/12 = 4 × 10/12 × 10 = 40/120
  3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
    21/40 = 21 × 3/40 × 3 = 63/120
  4. Add the two fractions:
    40/120 + 63/120 = 40 + 63/120 = 103/120

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