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Add 21/28 and 90/21

1st number: 21/28, 2nd number: 4 6/21

21/28 + 90/21 is 141/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 21 is 84
  2. For the 1st fraction, since 28 × 3 = 84,
    21/28 = 21 × 3/28 × 3 = 63/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    90/21 = 90 × 4/21 × 4 = 360/84
  4. Add the two fractions:
    63/84 + 360/84 = 63 + 360/84 = 423/84
  5. After reducing the fraction, the answer is 141/28
  6. In mixed form: 51/28

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