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Subtract 21/70 from 4/18

4/18 - 21/70 is -7/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 70 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 18 × 35 = 630,
    4/18 = 4 × 35/18 × 35 = 140/630
  3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
    21/70 = 21 × 9/70 × 9 = 189/630
  4. Subtract the two like fractions:
    140/630 - 189/630 = 140 - 189/630 = -49/630
  5. After reducing the fraction, the answer is -7/90

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