Answers

Subtract 40/21 from 45/25

1^st number: 1 20/25, 2^nd number: 1 19/21

45/25 - 40/21 is -11/105.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 25 and 21 is 525
   
   Next, find the equivalent fraction of both fractional numbers with denominator 525
2. For the 1st fraction, since 25 × 21 = 525,
   45/25 = 45 × 21/25 × 21 = 945/525
3. Likewise, for the 2nd fraction, since 21 × 25 = 525,
   40/21 = 40 × 25/21 × 25 = 1000/525
4. Subtract the two like fractions:
   945/525 - 1000/525 = 945 - 1000/525 = -55/525
5. After reducing the fraction, the answer is -11/105

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁹⁰/₂₅-⁴⁰/₂₁ ⁴⁵/₂₅-⁸⁰/₂₁ ⁴⁵/₅₀-⁴⁰/₂₁ ⁴⁵/₂₅-⁴⁰/₄₂ ⁴⁵/₇₅-⁴⁰/₂₁ ⁴⁵/₂₅-⁴⁰/₆₃

Subtract Fractions Calculator