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Add 42/90 and 21/42

42/90 + 21/42 is 29/30.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 42 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    42/90 = 42 × 7/90 × 7 = 294/630
  3. Likewise, for the 2nd fraction, since 42 × 15 = 630,
    21/42 = 21 × 15/42 × 15 = 315/630
  4. Add the two like fractions:
    294/630 + 315/630 = 294 + 315/630 = 609/630
  5. 609/630 simplified gives 29/30
  6. So, 42/90 + 21/42 = 29/30

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