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Subtract 72/24 from 21/70

1st number: 21/70, 2nd number: 3 0/24

21/70 - 72/24 is -27/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 24 is 840
  2. For the 1st fraction, since 70 × 12 = 840,
    21/70 = 21 × 12/70 × 12 = 252/840
  3. Likewise, for the 2nd fraction, since 24 × 35 = 840,
    72/24 = 72 × 35/24 × 35 = 2520/840
  4. Subtract the two fractions:
    252/840 - 2520/840 = 252 - 2520/840 = -2268/840
  5. After reducing the fraction, the answer is -27/10

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