Answers

Subtract 42/90 from 12/75

12/75 - 42/90 is -23/75.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 75 and 90 is 450
   
   Next, find the equivalent fraction of both fractional numbers with denominator 450
2. For the 1st fraction, since 75 × 6 = 450,
   12/75 = 12 × 6/75 × 6 = 72/450
3. Likewise, for the 2nd fraction, since 90 × 5 = 450,
   42/90 = 42 × 5/90 × 5 = 210/450
4. Subtract the two like fractions:
   72/450 - 210/450 = 72 - 210/450 = -138/450
5. After reducing the fraction, the answer is -23/75

MathStep (Works offline)

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

Related: ²⁴/₇₅-⁴²/₉₀ ¹²/₇₅-⁸⁴/₉₀ ³⁶/₇₅-⁴²/₉₀ ⁶⁰/₇₅-⁴²/₉₀ ⁸⁴/₇₅-⁴²/₉₀

Subtract Fractions Calculator