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Add 21/4 and 20/72

1st number: 5 1/4, 2nd number: 20/72

21/4 + 20/72 is 199/36.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 72 is 72

    Next, find the equivalent fraction of both fractional numbers with denominator 72
  2. For the 1st fraction, since 4 × 18 = 72,
    21/4 = 21 × 18/4 × 18 = 378/72
  3. Likewise, for the 2nd fraction, since 72 × 1 = 72,
    20/72 = 20 × 1/72 × 1 = 20/72
  4. Add the two like fractions:
    378/72 + 20/72 = 378 + 20/72 = 398/72
  5. 398/72 simplified gives 199/36
  6. So, 21/4 + 20/72 = 199/36
    In mixed form: 519/36

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