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Add 28/63 and 21/40

28/63 + 21/40 is 349/360.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 63 and 40 is 2520
  2. For the 1st fraction, since 63 × 40 = 2520,
    28/63 = 28 × 40/63 × 40 = 1120/2520
  3. Likewise, for the 2nd fraction, since 40 × 63 = 2520,
    21/40 = 21 × 63/40 × 63 = 1323/2520
  4. Add the two fractions:
    1120/2520 + 1323/2520 = 1120 + 1323/2520 = 2443/2520
  5. 2443/2520 simplified gives 349/360
  6. So, 28/63 + 21/40 = 349/360

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