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Add 1/42 and 21/90

1/42 + 21/90 is 9/35.

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,
    1/42 = 1 × 15/42 × 15 = 15/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    21/90 = 21 × 7/90 × 7 = 147/630
  4. Add the two like fractions:
    15/630 + 147/630 = 15 + 147/630 = 162/630
  5. 162/630 simplified gives 9/35
  6. So, 1/42 + 21/90 = 9/35

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