Answers

Subtract 28/54 from 7/42

7/42 - 28/54 is -19/54.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 54 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 42 × 9 = 378,
   7/42 = 7 × 9/42 × 9 = 63/378
3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
   28/54 = 28 × 7/54 × 7 = 196/378
4. Subtract the two like fractions:
   63/378 - 196/378 = 63 - 196/378 = -133/378
5. After reducing the fraction, the answer is -19/54

MathStep (Works offline)

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

Related: ¹⁴/₄₂-²⁸/₅₄ ⁷/₄₂-⁵⁶/₅₄ ⁷/₈₄-²⁸/₅₄ ²¹/₄₂-²⁸/₅₄ ⁷/₄₂-⁸⁴/₅₄ ³⁵/₄₂-²⁸/₅₄ ⁴⁹/₄₂-²⁸/₅₄

Subtract Fractions Calculator