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Subtract 40/70 from 20/45

20/45 - 40/70 is -8/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 70 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 45 × 14 = 630,
    20/45 = 20 × 14/45 × 14 = 280/630
  3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
    40/70 = 40 × 9/70 × 9 = 360/630
  4. Subtract the two like fractions:
    280/630 - 360/630 = 280 - 360/630 = -80/630
  5. After reducing the fraction, the answer is -8/63

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