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Add 21/20 and 84/15

1st number: 1 1/20, 2nd number: 5 9/15

21/20 + 84/15 is 133/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 15 is 60

    Next, find the equivalent fraction of both fractional numbers with denominator 60
  2. For the 1st fraction, since 20 × 3 = 60,
    21/20 = 21 × 3/20 × 3 = 63/60
  3. Likewise, for the 2nd fraction, since 15 × 4 = 60,
    84/15 = 84 × 4/15 × 4 = 336/60
  4. Add the two like fractions:
    63/60 + 336/60 = 63 + 336/60 = 399/60
  5. 399/60 simplified gives 133/20
  6. So, 21/20 + 84/15 = 133/20
    In mixed form: 613/20

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