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Subtract 45/42 from 4/90

1st number: 4/90, 2nd number: 1 3/42

4/90 - 45/42 is -647/630.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 42 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    4/90 = 4 × 7/90 × 7 = 28/630
  3. Likewise, for the 2nd fraction, since 42 × 15 = 630,
    45/42 = 45 × 15/42 × 15 = 675/630
  4. Subtract the two like fractions:
    28/630 - 675/630 = 28 - 675/630 = -647/630

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