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Add 40/72 and 12/90

40/72 + 12/90 is 31/45.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 90 is 360
  2. For the 1st fraction, since 72 × 5 = 360,
    40/72 = 40 × 5/72 × 5 = 200/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    12/90 = 12 × 4/90 × 4 = 48/360
  4. Add the two fractions:
    200/360 + 48/360 = 200 + 48/360 = 248/360
  5. After reducing the fraction, the answer is 31/45

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