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Subtract 21/45 from 1/70

1/70 - 21/45 is -19/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 45 is 630
  2. For the 1st fraction, since 70 × 9 = 630,
    1/70 = 1 × 9/70 × 9 = 9/630
  3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
    21/45 = 21 × 14/45 × 14 = 294/630
  4. Subtract the two fractions:
    9/630 - 294/630 = 9 - 294/630 = -285/630
  5. After reducing the fraction, the answer is -19/42

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