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Add 72/20 and 21/4

1st number: 3 12/20, 2nd number: 5 1/4

72/20 + 21/4 is 177/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 4 is 20
  2. For the 1st fraction, since 20 × 1 = 20,
    72/20 = 72 × 1/20 × 1 = 72/20
  3. Likewise, for the 2nd fraction, since 4 × 5 = 20,
    21/4 = 21 × 5/4 × 5 = 105/20
  4. Add the two fractions:
    72/20 + 105/20 = 72 + 105/20 = 177/20
  5. In mixed form: 817/20

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