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Add 8/21 and 15/40

8/21 + 15/40 is 127/168.

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,
    8/21 = 8 × 40/21 × 40 = 320/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    15/40 = 15 × 21/40 × 21 = 315/840
  4. Add the two like fractions:
    320/840 + 315/840 = 320 + 315/840 = 635/840
  5. 635/840 simplified gives 127/168
  6. So, 8/21 + 15/40 = 127/168

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