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Add 20/84 and 21/30

20/84 + 21/30 is 197/210.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 30 is 420
  2. For the 1st fraction, since 84 × 5 = 420,
    20/84 = 20 × 5/84 × 5 = 100/420
  3. Likewise, for the 2nd fraction, since 30 × 14 = 420,
    21/30 = 21 × 14/30 × 14 = 294/420
  4. Add the two fractions:
    100/420 + 294/420 = 100 + 294/420 = 394/420
  5. 394/420 simplified gives 197/210
  6. So, 20/84 + 21/30 = 197/210

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