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Add 28/70 and 3/90

28/70 + 3/90 is 13/30.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 90 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 70 × 9 = 630,
    28/70 = 28 × 9/70 × 9 = 252/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    3/90 = 3 × 7/90 × 7 = 21/630
  4. Add the two like fractions:
    252/630 + 21/630 = 252 + 21/630 = 273/630
  5. 273/630 simplified gives 13/30
  6. So, 28/70 + 3/90 = 13/30

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