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Add 21/54 and 16/20

21/54 + 16/20 is 107/90.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 20 is 540

    Next, find the equivalent fraction of both fractional numbers with denominator 540
  2. For the 1st fraction, since 54 × 10 = 540,
    21/54 = 21 × 10/54 × 10 = 210/540
  3. Likewise, for the 2nd fraction, since 20 × 27 = 540,
    16/20 = 16 × 27/20 × 27 = 432/540
  4. Add the two like fractions:
    210/540 + 432/540 = 210 + 432/540 = 642/540
  5. 642/540 simplified gives 107/90
  6. So, 21/54 + 16/20 = 107/90
    In mixed form: 117/90

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