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Add 27/40 and 21/63

27/40 + 21/63 is 121/120.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 63 is 2520

    Next, find the equivalent fraction of both fractional numbers with denominator 2520
  2. For the 1st fraction, since 40 × 63 = 2520,
    27/40 = 27 × 63/40 × 63 = 1701/2520
  3. Likewise, for the 2nd fraction, since 63 × 40 = 2520,
    21/63 = 21 × 40/63 × 40 = 840/2520
  4. Add the two like fractions:
    1701/2520 + 840/2520 = 1701 + 840/2520 = 2541/2520
  5. 2541/2520 simplified gives 121/120
  6. So, 27/40 + 21/63 = 121/120
    In mixed form: 11/120

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