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Add 28/42 and 21/90

28/42 + 21/90 is 9/10.

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,
    28/42 = 28 × 15/42 × 15 = 420/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    21/90 = 21 × 7/90 × 7 = 147/630
  4. Add the two fractions:
    420/630 + 147/630 = 420 + 147/630 = 567/630
  5. 567/630 simplified gives 9/10
  6. So, 28/42 + 21/90 = 9/10

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