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Subtract 21/70 from 18/24

18/24 - 21/70 is 9/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 24 and 70 is 840
  2. For the 1st fraction, since 24 × 35 = 840,
    18/24 = 18 × 35/24 × 35 = 630/840
  3. Likewise, for the 2nd fraction, since 70 × 12 = 840,
    21/70 = 21 × 12/70 × 12 = 252/840
  4. Subtract the two fractions:
    630/840 - 252/840 = 630 - 252/840 = 378/840
  5. After reducing the fraction, the answer is 9/20

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