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Subtract 21/70 from 4/63

4/63 - 21/70 is -149/630.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 63 and 70 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 63 × 10 = 630,
    4/63 = 4 × 10/63 × 10 = 40/630
  3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
    21/70 = 21 × 9/70 × 9 = 189/630
  4. Subtract the two like fractions:
    40/630 - 189/630 = 40 - 189/630 = -149/630

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