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Subtract 28/70 from 40/90

40/90 - 28/70 is 2/45.

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,
    40/90 = 40 × 7/90 × 7 = 280/630
  3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
    28/70 = 28 × 9/70 × 9 = 252/630
  4. Subtract the two fractions:
    280/630 - 252/630 = 280 - 252/630 = 28/630
  5. After reducing the fraction, the answer is 2/45

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