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Add 8/40 and 3/21

8/40 + 3/21 is 12/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 21 is 840
  2. For the 1st fraction, since 40 × 21 = 840,
    8/40 = 8 × 21/40 × 21 = 168/840
  3. Likewise, for the 2nd fraction, since 21 × 40 = 840,
    3/21 = 3 × 40/21 × 40 = 120/840
  4. Add the two fractions:
    168/840 + 120/840 = 168 + 120/840 = 288/840
  5. After reducing the fraction, the answer is 12/35

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