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Add 21/28 and 90/7

1st number: 21/28, 2nd number: 12 6/7

21/28 + 90/7 is 381/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 7 is 28
  2. For the 1st fraction, since 28 × 1 = 28,
    21/28 = 21 × 1/28 × 1 = 21/28
  3. Likewise, for the 2nd fraction, since 7 × 4 = 28,
    90/7 = 90 × 4/7 × 4 = 360/28
  4. Add the two fractions:
    21/28 + 360/28 = 21 + 360/28 = 381/28
  5. In mixed form: 1317/28

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