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Add 15/21 and 6/40

15/21 + 6/40 is 121/140.

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,
    15/21 = 15 × 40/21 × 40 = 600/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    6/40 = 6 × 21/40 × 21 = 126/840
  4. Add the two like fractions:
    600/840 + 126/840 = 600 + 126/840 = 726/840
  5. 726/840 simplified gives 121/140
  6. So, 15/21 + 6/40 = 121/140

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