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Add 20/45 and 21/28

20/45 + 21/28 is 43/36.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 28 is 1260

    Next, find the equivalent fraction of both fractional numbers with denominator 1260
  2. For the 1st fraction, since 45 × 28 = 1260,
    20/45 = 20 × 28/45 × 28 = 560/1260
  3. Likewise, for the 2nd fraction, since 28 × 45 = 1260,
    21/28 = 21 × 45/28 × 45 = 945/1260
  4. Add the two like fractions:
    560/1260 + 945/1260 = 560 + 945/1260 = 1505/1260
  5. 1505/1260 simplified gives 43/36
  6. So, 20/45 + 21/28 = 43/36
    In mixed form: 17/36

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