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Subtract 1/40 from 21/18

1st number: 1 3/18, 2nd number: 1/40

21/18 - 1/40 is 137/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 40 is 360
  2. For the 1st fraction, since 18 × 20 = 360,
    21/18 = 21 × 20/18 × 20 = 420/360
  3. Likewise, for the 2nd fraction, since 40 × 9 = 360,
    1/40 = 1 × 9/40 × 9 = 9/360
  4. Subtract the two fractions:
    420/360 - 9/360 = 420 - 9/360 = 411/360
  5. After reducing the fraction, the answer is 137/120
  6. In mixed form: 117/120

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