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Add 70/90 and 21/63

70/90 + 21/63 is 10/9.

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,
    21/63 = 21 × 10/63 × 10 = 210/630
  4. Add the two like fractions:
    490/630 + 210/630 = 490 + 210/630 = 700/630
  5. 700/630 simplified gives 10/9
  6. So, 70/90 + 21/63 = 10/9
    In mixed form: 11/9

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