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Add 20/21 and 40/54

20/21 + 40/54 is 320/189.

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,
    20/21 = 20 × 18/21 × 18 = 360/378
  3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
    40/54 = 40 × 7/54 × 7 = 280/378
  4. Add the two fractions:
    360/378 + 280/378 = 360 + 280/378 = 640/378
  5. 640/378 simplified gives 320/189
  6. So, 20/21 + 40/54 = 320/189
    In mixed form: 1131/189

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