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Add 20/28 and 63/90

20/28 + 63/90 is 99/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 90 is 1260

    Next, find the equivalent fraction of both fractional numbers with denominator 1260
  2. For the 1st fraction, since 28 × 45 = 1260,
    20/28 = 20 × 45/28 × 45 = 900/1260
  3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
    63/90 = 63 × 14/90 × 14 = 882/1260
  4. Add the two like fractions:
    900/1260 + 882/1260 = 900 + 882/1260 = 1782/1260
  5. 1782/1260 simplified gives 99/70
  6. So, 20/28 + 63/90 = 99/70
    In mixed form: 129/70

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