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Subtract 84/20 from 21/70

1st number: 21/70, 2nd number: 4 4/20

21/70 - 84/20 is -39/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 20 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 70 × 2 = 140,
    21/70 = 21 × 2/70 × 2 = 42/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    84/20 = 84 × 7/20 × 7 = 588/140
  4. Subtract the two like fractions:
    42/140 - 588/140 = 42 - 588/140 = -546/140
  5. After reducing the fraction, the answer is -39/10

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