Answers

Subtract 1/90 from 45/20

1^st number: 2 5/20, 2^nd number: 1/90

45/20 - 1/90 is 403/180.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 90 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 20 × 9 = 180,
   45/20 = 45 × 9/20 × 9 = 405/180
3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
   1/90 = 1 × 2/90 × 2 = 2/180
4. Subtract the two like fractions:
   405/180 - 2/180 = 405 - 2/180 = 403/180
5. In mixed form: 243/180

MathStep (Works offline)

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

Related: ⁹⁰/₂₀-¹/₉₀ ⁴⁵/₂₀-²/₉₀ ⁴⁵/₄₀-¹/₉₀ ⁴⁵/₂₀-³/₉₀ ⁴⁵/₆₀-¹/₉₀ ⁴⁵/₂₀-⁵/₉₀ ⁴⁵/₂₀-⁷/₉₀

Subtract Fractions Calculator