Answers

Subtract 15/81 from 98/70

1^st number: 1 28/70, 2^nd number: 15/81

98/70 - 15/81 is 164/135.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 81 is 5670
   
   Next, find the equivalent fraction of both fractional numbers with denominator 5670
2. For the 1st fraction, since 70 × 81 = 5670,
   98/70 = 98 × 81/70 × 81 = 7938/5670
3. Likewise, for the 2nd fraction, since 81 × 70 = 5670,
   15/81 = 15 × 70/81 × 70 = 1050/5670
4. Subtract the two like fractions:
   7938/5670 - 1050/5670 = 7938 - 1050/5670 = 6888/5670
5. After reducing the fraction, the answer is 164/135
6. In mixed form: 129/135

MathStep (Works offline)

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

Related: ⁹⁸/₇₀-³⁰/₈₁ ⁹⁸/₇₀-⁴⁵/₈₁ ⁹⁸/₇₀-⁷⁵/₈₁

Subtract Fractions Calculator