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Add 7/21 and 21/90

7/21 + 21/90 is 17/30.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 90 is 630
  2. For the 1st fraction, since 21 × 30 = 630,
    7/21 = 7 × 30/21 × 30 = 210/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    21/90 = 21 × 7/90 × 7 = 147/630
  4. Add the two fractions:
    210/630 + 147/630 = 210 + 147/630 = 357/630
  5. 357/630 simplified gives 17/30
  6. So, 7/21 + 21/90 = 17/30

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