Answers

Subtract 35/21 from 12/9

1^st number: 1 3/9, 2^nd number: 1 14/21

12/9 - 35/21 is -1/3.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 9 and 21 is 63
   
   Next, find the equivalent fraction of both fractional numbers with denominator 63
2. For the 1st fraction, since 9 × 7 = 63,
   12/9 = 12 × 7/9 × 7 = 84/63
3. Likewise, for the 2nd fraction, since 21 × 3 = 63,
   35/21 = 35 × 3/21 × 3 = 105/63
4. Subtract the two like fractions:
   84/63 - 105/63 = 84 - 105/63 = -21/63
5. After reducing the fraction, the answer is -1/3

MathStep (Works offline)

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

Related: ²⁴/₉-³⁵/₂₁ ¹²/₉-⁷⁰/₂₁ ¹²/₁₈-³⁵/₂₁ ¹²/₉-³⁵/₄₂ ³⁶/₉-³⁵/₂₁ ¹²/₂₇-³⁵/₂₁ ¹²/₉-³⁵/₆₃ ⁶⁰/₉-³⁵/₂₁ ¹²/₄₅-³⁵/₂₁ ⁸⁴/₉-³⁵/₂₁ ¹²/₆₃-³⁵/₂₁

Subtract Fractions Calculator