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Add 21/80 and 28/63

21/80 + 28/63 is 509/720.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 63 is 5040
  2. For the 1st fraction, since 80 × 63 = 5040,
    21/80 = 21 × 63/80 × 63 = 1323/5040
  3. Likewise, for the 2nd fraction, since 63 × 80 = 5040,
    28/63 = 28 × 80/63 × 80 = 2240/5040
  4. Add the two fractions:
    1323/5040 + 2240/5040 = 1323 + 2240/5040 = 3563/5040
  5. 3563/5040 simplified gives 509/720
  6. So, 21/80 + 28/63 = 509/720

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