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Add 21/40 and 12/63

21/40 + 12/63 is 601/840.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 63 is 2520
  2. For the 1st fraction, since 40 × 63 = 2520,
    21/40 = 21 × 63/40 × 63 = 1323/2520
  3. Likewise, for the 2nd fraction, since 63 × 40 = 2520,
    12/63 = 12 × 40/63 × 40 = 480/2520
  4. Add the two fractions:
    1323/2520 + 480/2520 = 1323 + 480/2520 = 1803/2520
  5. 1803/2520 simplified gives 601/840
  6. So, 21/40 + 12/63 = 601/840

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