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Add 12/40 and 20/21

12/40 + 20/21 is 263/210.

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,
    12/40 = 12 × 21/40 × 21 = 252/840
  3. Likewise, for the 2nd fraction, since 21 × 40 = 840,
    20/21 = 20 × 40/21 × 40 = 800/840
  4. Add the two like fractions:
    252/840 + 800/840 = 252 + 800/840 = 1052/840
  5. 1052/840 simplified gives 263/210
  6. So, 12/40 + 20/21 = 263/210
    In mixed form: 153/210

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