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Add 70/90 and 20/63

70/90 + 20/63 is 23/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 63 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    70/90 = 70 × 7/90 × 7 = 490/630
  3. Likewise, for the 2nd fraction, since 63 × 10 = 630,
    20/63 = 20 × 10/63 × 10 = 200/630
  4. Add the two like fractions:
    490/630 + 200/630 = 490 + 200/630 = 690/630
  5. 690/630 simplified gives 23/21
  6. So, 70/90 + 20/63 = 23/21
    In mixed form: 12/21

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