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Subtract 21/70 from 42/24

1st number: 1 18/24, 2nd number: 21/70

42/24 - 21/70 is 29/20.

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,
    42/24 = 42 × 35/24 × 35 = 1470/840
  3. Likewise, for the 2nd fraction, since 70 × 12 = 840,
    21/70 = 21 × 12/70 × 12 = 252/840
  4. Subtract the two fractions:
    1470/840 - 252/840 = 1470 - 252/840 = 1218/840
  5. After reducing the fraction, the answer is 29/20
  6. In mixed form: 19/20

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