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Add 21/4 and 63/90

1st number: 5 1/4, 2nd number: 63/90

21/4 + 63/90 is 119/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 90 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 90 × 2 = 180,
    63/90 = 63 × 2/90 × 2 = 126/180
  4. Add the two like fractions:
    945/180 + 126/180 = 945 + 126/180 = 1071/180
  5. 1071/180 simplified gives 119/20
  6. So, 21/4 + 63/90 = 119/20
    In mixed form: 519/20

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