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Add 36/40 and 21/90

36/40 + 21/90 is 17/15.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 90 is 360
  2. For the 1st fraction, since 40 × 9 = 360,
    36/40 = 36 × 9/40 × 9 = 324/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    21/90 = 21 × 4/90 × 4 = 84/360
  4. Add the two fractions:
    324/360 + 84/360 = 324 + 84/360 = 408/360
  5. After reducing the fraction, the answer is 17/15
  6. In mixed form: 12/15

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