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Subtract 70/45 from 21/70

1st number: 21/70, 2nd number: 1 25/45

21/70 - 70/45 is -113/90.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 70 × 9 = 630,
    21/70 = 21 × 9/70 × 9 = 189/630
  3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
    70/45 = 70 × 14/45 × 14 = 980/630
  4. Subtract the two like fractions:
    189/630 - 980/630 = 189 - 980/630 = -791/630
  5. After reducing the fraction, the answer is -113/90

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