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Add 70/72 and 21/90

70/72 + 21/90 is 217/180.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 90 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 72 × 5 = 360,
    70/72 = 70 × 5/72 × 5 = 350/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    21/90 = 21 × 4/90 × 4 = 84/360
  4. Add the two like fractions:
    350/360 + 84/360 = 350 + 84/360 = 434/360
  5. 434/360 simplified gives 217/180
  6. So, 70/72 + 21/90 = 217/180
    In mixed form: 137/180

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