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Add 21/28 and 9/45

21/28 + 9/45 is 19/20.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 1260
  2. For the 1st fraction, since 28 × 45 = 1260,
    21/28 = 21 × 45/28 × 45 = 945/1260
  3. Likewise, for the 2nd fraction, since 45 × 28 = 1260,
    9/45 = 9 × 28/45 × 28 = 252/1260
  4. Add the two like fractions:
    945/1260 + 252/1260 = 945 + 252/1260 = 1197/1260
  5. 1197/1260 simplified gives 19/20
  6. So, 21/28 + 9/45 = 19/20

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