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Add 4/42 and 18/90

4/42 + 18/90 is 31/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 90 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 42 × 15 = 630,
    4/42 = 4 × 15/42 × 15 = 60/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    18/90 = 18 × 7/90 × 7 = 126/630
  4. Add the two like fractions:
    60/630 + 126/630 = 60 + 126/630 = 186/630
  5. 186/630 simplified gives 31/105
  6. So, 4/42 + 18/90 = 31/105

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