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Add 81/4 and 21/90

1st number: 20 1/4, 2nd number: 21/90

81/4 + 21/90 is 1229/60.

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,
    81/4 = 81 × 45/4 × 45 = 3645/180
  3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
    21/90 = 21 × 2/90 × 2 = 42/180
  4. Add the two like fractions:
    3645/180 + 42/180 = 3645 + 42/180 = 3687/180
  5. 3687/180 simplified gives 1229/60
  6. So, 81/4 + 21/90 = 1229/60
    In mixed form: 2029/60

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