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Add 20/42 and 3/90

20/42 + 3/90 is 107/210.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 90 is 630
  2. For the 1st fraction, since 42 × 15 = 630,
    20/42 = 20 × 15/42 × 15 = 300/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    3/90 = 3 × 7/90 × 7 = 21/630
  4. Add the two fractions:
    300/630 + 21/630 = 300 + 21/630 = 321/630
  5. After reducing the fraction, the answer is 107/210

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