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Add 20/30 and 21/63

20/30 + 21/63 is 1/1.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 63 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 30 × 21 = 630,
    20/30 = 20 × 21/30 × 21 = 420/630
  3. Likewise, for the 2nd fraction, since 63 × 10 = 630,
    21/63 = 21 × 10/63 × 10 = 210/630
  4. Add the two like fractions:
    420/630 + 210/630 = 420 + 210/630 = 630/630
  5. 630/630 simplified gives 1/1
  6. So, 20/30 + 21/63 = 1/1

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