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Subtract 40/70 from 80/90

80/90 - 40/70 is 20/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 70 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    80/90 = 80 × 7/90 × 7 = 560/630
  3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
    40/70 = 40 × 9/70 × 9 = 360/630
  4. Subtract the two like fractions:
    560/630 - 360/630 = 560 - 360/630 = 200/630
  5. After reducing the fraction, the answer is 20/63

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