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Add 12/21 and 21/54

12/21 + 21/54 is 121/126.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 54 is 378
  2. For the 1st fraction, since 21 × 18 = 378,
    12/21 = 12 × 18/21 × 18 = 216/378
  3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
    21/54 = 21 × 7/54 × 7 = 147/378
  4. Add the two fractions:
    216/378 + 147/378 = 216 + 147/378 = 363/378
  5. 363/378 simplified gives 121/126
  6. So, 12/21 + 21/54 = 121/126

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