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Add 18/21 and 20/40

18/21 + 20/40 is 19/14.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840
  2. For the 1st fraction, since 21 × 40 = 840,
    18/21 = 18 × 40/21 × 40 = 720/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    20/40 = 20 × 21/40 × 21 = 420/840
  4. Add the two fractions:
    720/840 + 420/840 = 720 + 420/840 = 1140/840
  5. After reducing the fraction, the answer is 19/14
  6. In mixed form: 15/14

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