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Add 21/40 and 80/90

21/40 + 80/90 is 509/360.

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,
    21/40 = 21 × 9/40 × 9 = 189/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    80/90 = 80 × 4/90 × 4 = 320/360
  4. Add the two fractions:
    189/360 + 320/360 = 189 + 320/360 = 509/360
  5. In mixed form: 1149/360

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