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Add 72/18 and 81/90

1st number: 4 0/18, 2nd number: 81/90

72/18 + 81/90 is 49/10.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 90 is 90
  2. For the 1st fraction, since 18 × 5 = 90,
    72/18 = 72 × 5/18 × 5 = 360/90
  3. Likewise, for the 2nd fraction, since 90 × 1 = 90,
    81/90 = 81 × 1/90 × 1 = 81/90
  4. Add the two fractions:
    360/90 + 81/90 = 360 + 81/90 = 441/90
  5. 441/90 simplified gives 49/10
  6. So, 72/18 + 81/90 = 49/10
    In mixed form: 49/10

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