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Add 21/40 and 15/12

1st number: 21/40, 2nd number: 1 3/12

21/40 + 15/12 is 71/40.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 40 × 3 = 120,
    21/40 = 21 × 3/40 × 3 = 63/120
  3. Likewise, for the 2nd fraction, since 12 × 10 = 120,
    15/12 = 15 × 10/12 × 10 = 150/120
  4. Add the two like fractions:
    63/120 + 150/120 = 63 + 150/120 = 213/120
  5. 213/120 simplified gives 71/40
  6. So, 21/40 + 15/12 = 71/40
    In mixed form: 131/40

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