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Add 20/21 and 25/8

1st number: 20/21, 2nd number: 3 1/8

20/21 + 25/8 is 685/168.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 8 is 168
  2. For the 1st fraction, since 21 × 8 = 168,
    20/21 = 20 × 8/21 × 8 = 160/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    25/8 = 25 × 21/8 × 21 = 525/168
  4. Add the two fractions:
    160/168 + 525/168 = 160 + 525/168 = 685/168
  5. So, 20/21 + 25/8 = 685/168
    In mixed form: 413/168

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