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Add 1/21 and 18/40

1/21 + 18/40 is 209/420.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 21 × 40 = 840,
    1/21 = 1 × 40/21 × 40 = 40/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    18/40 = 18 × 21/40 × 21 = 378/840
  4. Add the two like fractions:
    40/840 + 378/840 = 40 + 378/840 = 418/840
  5. 418/840 simplified gives 209/420
  6. So, 1/21 + 18/40 = 209/420

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