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Add 20/72 and 28/45

20/72 + 28/45 is 9/10.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 45 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 72 × 5 = 360,
    20/72 = 20 × 5/72 × 5 = 100/360
  3. Likewise, for the 2nd fraction, since 45 × 8 = 360,
    28/45 = 28 × 8/45 × 8 = 224/360
  4. Add the two like fractions:
    100/360 + 224/360 = 100 + 224/360 = 324/360
  5. 324/360 simplified gives 9/10
  6. So, 20/72 + 28/45 = 9/10

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