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Add 90/20 and 7/84

1st number: 4 10/20, 2nd number: 7/84

90/20 + 7/84 is 55/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 84 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 20 × 21 = 420,
    90/20 = 90 × 21/20 × 21 = 1890/420
  3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
    7/84 = 7 × 5/84 × 5 = 35/420
  4. Add the two like fractions:
    1890/420 + 35/420 = 1890 + 35/420 = 1925/420
  5. 1925/420 simplified gives 55/12
  6. So, 90/20 + 7/84 = 55/12
    In mixed form: 47/12

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