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Add 5/21 and 12/40

5/21 + 12/40 is 113/210.

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,
    5/21 = 5 × 40/21 × 40 = 200/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    12/40 = 12 × 21/40 × 21 = 252/840
  4. Add the two like fractions:
    200/840 + 252/840 = 200 + 252/840 = 452/840
  5. 452/840 simplified gives 113/210
  6. So, 5/21 + 12/40 = 113/210

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