Answers

Subtract 21/54 from 42/15

1^st number: 2 12/15, 2^nd number: 21/54

42/15 - 21/54 is 217/90.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 54 is 270
   
   Next, find the equivalent fraction of both fractional numbers with denominator 270
2. For the 1st fraction, since 15 × 18 = 270,
   42/15 = 42 × 18/15 × 18 = 756/270
3. Likewise, for the 2nd fraction, since 54 × 5 = 270,
   21/54 = 21 × 5/54 × 5 = 105/270
4. Subtract the two like fractions:
   756/270 - 105/270 = 756 - 105/270 = 651/270
5. After reducing the fraction, the answer is 217/90
6. In mixed form: 237/90

MathStep (Works offline)

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

Related: ⁸⁴/₁₅-²¹/₅₄ ⁴²/₁₅-⁴²/₅₄ ⁴²/₃₀-²¹/₅₄ ⁴²/₁₅-⁶³/₅₄ ⁴²/₄₅-²¹/₅₄ ⁴²/₇₅-²¹/₅₄

Subtract Fractions Calculator