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Add 30/54 and 21/40

30/54 + 21/40 is 389/360.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 40 is 1080

    Next, find the equivalent fraction of both fractional numbers with denominator 1080
  2. For the 1st fraction, since 54 × 20 = 1080,
    30/54 = 30 × 20/54 × 20 = 600/1080
  3. Likewise, for the 2nd fraction, since 40 × 27 = 1080,
    21/40 = 21 × 27/40 × 27 = 567/1080
  4. Add the two like fractions:
    600/1080 + 567/1080 = 600 + 567/1080 = 1167/1080
  5. 1167/1080 simplified gives 389/360
  6. So, 30/54 + 21/40 = 389/360
    In mixed form: 129/360

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