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Subtract 24/70 from 21/90

21/90 - 24/70 is -23/210.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 70 is 630
  2. For the 1st fraction, since 90 × 7 = 630,
    21/90 = 21 × 7/90 × 7 = 147/630
  3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
    24/70 = 24 × 9/70 × 9 = 216/630
  4. Subtract the two fractions:
    147/630 - 216/630 = 147 - 216/630 = -69/630
  5. After reducing the fraction, the answer is -23/210

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