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Add 18/21 and 90/40

1st number: 18/21, 2nd number: 2 10/40

18/21 + 90/40 is 87/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840
  2. For the 1st fraction, since 21 × 40 = 840,
    18/21 = 18 × 40/21 × 40 = 720/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    90/40 = 90 × 21/40 × 21 = 1890/840
  4. Add the two fractions:
    720/840 + 1890/840 = 720 + 1890/840 = 2610/840
  5. 2610/840 simplified gives 87/28
  6. So, 18/21 + 90/40 = 87/28
    In mixed form: 33/28

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