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Subtract 21/90 from 7/35

7/35 - 21/90 is -1/30.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 90 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 35 × 18 = 630,
    7/35 = 7 × 18/35 × 18 = 126/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    21/90 = 21 × 7/90 × 7 = 147/630
  4. Subtract the two like fractions:
    126/630 - 147/630 = 126 - 147/630 = -21/630
  5. After reducing the fraction, the answer is -1/30

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