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Add 15/25 and 20/21

15/25 + 20/21 is 163/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 25 and 21 is 525

    Next, find the equivalent fraction of both fractional numbers with denominator 525
  2. For the 1st fraction, since 25 × 21 = 525,
    15/25 = 15 × 21/25 × 21 = 315/525
  3. Likewise, for the 2nd fraction, since 21 × 25 = 525,
    20/21 = 20 × 25/21 × 25 = 500/525
  4. Add the two like fractions:
    315/525 + 500/525 = 315 + 500/525 = 815/525
  5. 815/525 simplified gives 163/105
  6. So, 15/25 + 20/21 = 163/105
    In mixed form: 158/105

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