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Add 18/40 and 21/28

18/40 + 21/28 is 6/5.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 28 is 280
  2. For the 1st fraction, since 40 × 7 = 280,
    18/40 = 18 × 7/40 × 7 = 126/280
  3. Likewise, for the 2nd fraction, since 28 × 10 = 280,
    21/28 = 21 × 10/28 × 10 = 210/280
  4. Add the two fractions:
    126/280 + 210/280 = 126 + 210/280 = 336/280
  5. 336/280 simplified gives 6/5
  6. So, 18/40 + 21/28 = 6/5
    In mixed form: 11/5

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