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Add 4/21 and 25/40

4/21 + 25/40 is 137/168.

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,
    4/21 = 4 × 40/21 × 40 = 160/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    25/40 = 25 × 21/40 × 21 = 525/840
  4. Add the two fractions:
    160/840 + 525/840 = 160 + 525/840 = 685/840
  5. 685/840 simplified gives 137/168
  6. So, 4/21 + 25/40 = 137/168

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