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Add 15/42 and 7/90

15/42 + 7/90 is 137/315.

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,
    15/42 = 15 × 15/42 × 15 = 225/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    7/90 = 7 × 7/90 × 7 = 49/630
  4. Add the two like fractions:
    225/630 + 49/630 = 225 + 49/630 = 274/630
  5. 274/630 simplified gives 137/315
  6. So, 15/42 + 7/90 = 137/315

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