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Add 84/4 and 21/90

1st number: 21 0/4, 2nd number: 21/90

84/4 + 21/90 is 637/30.

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,
    84/4 = 84 × 45/4 × 45 = 3780/180
  3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
    21/90 = 21 × 2/90 × 2 = 42/180
  4. Add the two like fractions:
    3780/180 + 42/180 = 3780 + 42/180 = 3822/180
  5. 3822/180 simplified gives 637/30
  6. So, 84/4 + 21/90 = 637/30
    In mixed form: 217/30

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