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Add 25/40 and 40/90

25/40 + 40/90 is 77/72.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 90 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 40 × 9 = 360,
    25/40 = 25 × 9/40 × 9 = 225/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    40/90 = 40 × 4/90 × 4 = 160/360
  4. Add the two like fractions:
    225/360 + 160/360 = 225 + 160/360 = 385/360
  5. 385/360 simplified gives 77/72
  6. So, 25/40 + 40/90 = 77/72
    In mixed form: 15/72

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