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Add 20/60 and 21/90

20/60 + 21/90 is 17/30.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 60 and 90 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 60 × 3 = 180,
    20/60 = 20 × 3/60 × 3 = 60/180
  3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
    21/90 = 21 × 2/90 × 2 = 42/180
  4. Add the two like fractions:
    60/180 + 42/180 = 60 + 42/180 = 102/180
  5. 102/180 simplified gives 17/30
  6. So, 20/60 + 21/90 = 17/30

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