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Add 21/4 and 15/45

1st number: 5 1/4, 2nd number: 15/45

21/4 + 15/45 is 67/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 45 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 4 × 45 = 180,
    21/4 = 21 × 45/4 × 45 = 945/180
  3. Likewise, for the 2nd fraction, since 45 × 4 = 180,
    15/45 = 15 × 4/45 × 4 = 60/180
  4. Add the two like fractions:
    945/180 + 60/180 = 945 + 60/180 = 1005/180
  5. 1005/180 simplified gives 67/12
  6. So, 21/4 + 15/45 = 67/12
    In mixed form: 57/12

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