Answers

Subtract 72/20 from 54/70

1^st number: 54/70, 2^nd number: 3 12/20

54/70 - 72/20 is -99/35.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 20 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 70 × 2 = 140,
   54/70 = 54 × 2/70 × 2 = 108/140
3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
   72/20 = 72 × 7/20 × 7 = 504/140
4. Subtract the two like fractions:
   108/140 - 504/140 = 108 - 504/140 = -396/140
5. After reducing the fraction, the answer is -99/35

MathStep (Works offline)

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

Related: ⁵⁴/₇₀-⁷²/₄₀ ⁵⁴/₇₀-⁷²/₆₀

Subtract Fractions Calculator