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Add 18/45 and 15/42

18/45 + 15/42 is 53/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 42 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 45 × 14 = 630,
    18/45 = 18 × 14/45 × 14 = 252/630
  3. Likewise, for the 2nd fraction, since 42 × 15 = 630,
    15/42 = 15 × 15/42 × 15 = 225/630
  4. Add the two like fractions:
    252/630 + 225/630 = 252 + 225/630 = 477/630
  5. 477/630 simplified gives 53/70
  6. So, 18/45 + 15/42 = 53/70

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