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Add 21/15 and 20/90

1st number: 1 6/15, 2nd number: 20/90

21/15 + 20/90 is 73/45.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 90 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 15 × 6 = 90,
    21/15 = 21 × 6/15 × 6 = 126/90
  3. Likewise, for the 2nd fraction, since 90 × 1 = 90,
    20/90 = 20 × 1/90 × 1 = 20/90
  4. Add the two like fractions:
    126/90 + 20/90 = 126 + 20/90 = 146/90
  5. 146/90 simplified gives 73/45
  6. So, 21/15 + 20/90 = 73/45
    In mixed form: 128/45

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