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Add 2/21 and 27/40

2/21 + 27/40 is 647/840.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840
  2. For the 1st fraction, since 21 × 40 = 840,
    2/21 = 2 × 40/21 × 40 = 80/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    27/40 = 27 × 21/40 × 21 = 567/840
  4. Add the two fractions:
    80/840 + 567/840 = 80 + 567/840 = 647/840
  5. So, 2/21 + 27/40 = 647/840

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