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Add 28/35 and 20/90

28/35 + 20/90 is 46/45.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 90 is 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,
    20/90 = 20 × 7/90 × 7 = 140/630
  4. Add the two fractions:
    504/630 + 140/630 = 504 + 140/630 = 644/630
  5. 644/630 simplified gives 46/45
  6. So, 28/35 + 20/90 = 46/45
    In mixed form: 11/45

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