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Subtract 20/21 from 30/4

1st number: 7 2/4, 2nd number: 20/21

30/4 - 20/21 is 275/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 21 is 84
  2. For the 1st fraction, since 4 × 21 = 84,
    30/4 = 30 × 21/4 × 21 = 630/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    20/21 = 20 × 4/21 × 4 = 80/84
  4. Subtract the two fractions:
    630/84 - 80/84 = 630 - 80/84 = 550/84
  5. After reducing the fraction, the answer is 275/42
  6. In mixed form: 623/42

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