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Add 21/40 and 5/9

21/40 + 5/9 is 389/360.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 9 is 360
  2. For the 1st fraction, since 40 × 9 = 360,
    21/40 = 21 × 9/40 × 9 = 189/360
  3. Likewise, for the 2nd fraction, since 9 × 40 = 360,
    5/9 = 5 × 40/9 × 40 = 200/360
  4. Add the two fractions:
    189/360 + 200/360 = 189 + 200/360 = 389/360
  5. In mixed form: 129/360

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