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Add 20/21 and 8/30

20/21 + 8/30 is 128/105.

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,
    20/21 = 20 × 10/21 × 10 = 200/210
  3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
    8/30 = 8 × 7/30 × 7 = 56/210
  4. Add the two fractions:
    200/210 + 56/210 = 200 + 56/210 = 256/210
  5. After reducing the fraction, the answer is 128/105
  6. In mixed form: 123/105

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