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Subtract 8/7 from 21/4

1st number: 5 1/4, 2nd number: 1 1/7

21/4 - 8/7 is 115/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 7 is 28
  2. For the 1st fraction, since 4 × 7 = 28,
    21/4 = 21 × 7/4 × 7 = 147/28
  3. Likewise, for the 2nd fraction, since 7 × 4 = 28,
    8/7 = 8 × 4/7 × 4 = 32/28
  4. Subtract the two fractions:
    147/28 - 32/28 = 147 - 32/28 = 115/28
  5. In mixed form: 43/28

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