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Add 42/56 and 20/90

42/56 + 20/90 is 35/36.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 56 and 90 is 2520
  2. For the 1st fraction, since 56 × 45 = 2520,
    42/56 = 42 × 45/56 × 45 = 1890/2520
  3. Likewise, for the 2nd fraction, since 90 × 28 = 2520,
    20/90 = 20 × 28/90 × 28 = 560/2520
  4. Add the two fractions:
    1890/2520 + 560/2520 = 1890 + 560/2520 = 2450/2520
  5. 2450/2520 simplified gives 35/36
  6. So, 42/56 + 20/90 = 35/36

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