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Add 10/90 and 8/21

10/90 + 8/21 is 31/63.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 21 is 630
  2. For the 1st fraction, since 90 × 7 = 630,
    10/90 = 10 × 7/90 × 7 = 70/630
  3. Likewise, for the 2nd fraction, since 21 × 30 = 630,
    8/21 = 8 × 30/21 × 30 = 240/630
  4. Add the two fractions:
    70/630 + 240/630 = 70 + 240/630 = 310/630
  5. After reducing the fraction, the answer is 31/63

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