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Add 21/84 and 18/7

1st number: 21/84, 2nd number: 2 4/7

21/84 + 18/7 is 79/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 7 is 84
  2. For the 1st fraction, since 84 × 1 = 84,
    21/84 = 21 × 1/84 × 1 = 21/84
  3. Likewise, for the 2nd fraction, since 7 × 12 = 84,
    18/7 = 18 × 12/7 × 12 = 216/84
  4. Add the two fractions:
    21/84 + 216/84 = 21 + 216/84 = 237/84
  5. 237/84 simplified gives 79/28
  6. So, 21/84 + 18/7 = 79/28
    In mixed form: 223/28

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