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Subtract 21/70 from 12/9

1st number: 1 3/9, 2nd number: 21/70

12/9 - 21/70 is 31/30.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 70 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 9 × 70 = 630,
    12/9 = 12 × 70/9 × 70 = 840/630
  3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
    21/70 = 21 × 9/70 × 9 = 189/630
  4. Subtract the two like fractions:
    840/630 - 189/630 = 840 - 189/630 = 651/630
  5. After reducing the fraction, the answer is 31/30
  6. In mixed form: 11/30

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