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Add 21/72 and 12/20

21/72 + 12/20 is 107/120.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 20 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 72 × 5 = 360,
    21/72 = 21 × 5/72 × 5 = 105/360
  3. Likewise, for the 2nd fraction, since 20 × 18 = 360,
    12/20 = 12 × 18/20 × 18 = 216/360
  4. Add the two like fractions:
    105/360 + 216/360 = 105 + 216/360 = 321/360
  5. 321/360 simplified gives 107/120
  6. So, 21/72 + 12/20 = 107/120

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