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Add 90/21 and 35/15

1st number: 4 6/21, 2nd number: 2 5/15

90/21 + 35/15 is 139/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 15 is 105
  2. For the 1st fraction, since 21 × 5 = 105,
    90/21 = 90 × 5/21 × 5 = 450/105
  3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
    35/15 = 35 × 7/15 × 7 = 245/105
  4. Add the two fractions:
    450/105 + 245/105 = 450 + 245/105 = 695/105
  5. After reducing the fraction, the answer is 139/21
  6. In mixed form: 613/21

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