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Add 28/35 and 21/90

28/35 + 21/90 is 31/30.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 90 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 35 × 18 = 630,
    28/35 = 28 × 18/35 × 18 = 504/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    21/90 = 21 × 7/90 × 7 = 147/630
  4. Add the two like fractions:
    504/630 + 147/630 = 504 + 147/630 = 651/630
  5. 651/630 simplified gives 31/30
  6. So, 28/35 + 21/90 = 31/30
    In mixed form: 11/30

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