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Add 20/21 and 60/90

20/21 + 60/90 is 34/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 90 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 21 × 30 = 630,
    20/21 = 20 × 30/21 × 30 = 600/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    60/90 = 60 × 7/90 × 7 = 420/630
  4. Add the two like fractions:
    600/630 + 420/630 = 600 + 420/630 = 1020/630
  5. 1020/630 simplified gives 34/21
  6. So, 20/21 + 60/90 = 34/21
    In mixed form: 113/21

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