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Add 18/40 and 81/21

1st number: 18/40, 2nd number: 3 18/21

18/40 + 81/21 is 603/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 21 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 40 × 21 = 840,
    18/40 = 18 × 21/40 × 21 = 378/840
  3. Likewise, for the 2nd fraction, since 21 × 40 = 840,
    81/21 = 81 × 40/21 × 40 = 3240/840
  4. Add the two like fractions:
    378/840 + 3240/840 = 378 + 3240/840 = 3618/840
  5. 3618/840 simplified gives 603/140
  6. So, 18/40 + 81/21 = 603/140
    In mixed form: 443/140

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