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Add 1/21 and 20/30

1/21 + 20/30 is 5/7.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 30 is 210
  2. For the 1st fraction, since 21 × 10 = 210,
    1/21 = 1 × 10/21 × 10 = 10/210
  3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
    20/30 = 20 × 7/30 × 7 = 140/210
  4. Add the two fractions:
    10/210 + 140/210 = 10 + 140/210 = 150/210
  5. After reducing the fraction, the answer is 5/7

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