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Add 1/90 and 18/80

1/90 + 18/80 is 17/72.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 80 is 720

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 90 × 8 = 720,
    1/90 = 1 × 8/90 × 8 = 8/720
  3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
    18/80 = 18 × 9/80 × 9 = 162/720
  4. Add the two like fractions:
    8/720 + 162/720 = 8 + 162/720 = 170/720
  5. 170/720 simplified gives 17/72
  6. So, 1/90 + 18/80 = 17/72

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