Answers

Subtract 16/7 from 8/21

1^st number: 8/21, 2^nd number: 2 2/7

8/21 - 16/7 is -40/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 7 is 21
   
   Next, find the equivalent fraction of both fractional numbers with denominator 21
2. For the 1st fraction, since 21 × 1 = 21,
   8/21 = 8 × 1/21 × 1 = 8/21
3. Likewise, for the 2nd fraction, since 7 × 3 = 21,
   16/7 = 16 × 3/7 × 3 = 48/21
4. Subtract the two like fractions:
   8/21 - 48/21 = 8 - 48/21 = -40/21

MathStep (Works offline)

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

Related: ¹⁶/₂₁-¹⁶/₇ ⁸/₂₁-³²/₇ ⁸/₄₂-¹⁶/₇ ⁸/₂₁-¹⁶/₁₄ ²⁴/₂₁-¹⁶/₇ ⁸/₂₁-⁴⁸/₇ ⁸/₆₃-¹⁶/₇ ⁸/₂₁-¹⁶/₂₁ ⁴⁰/₂₁-¹⁶/₇ ⁸/₂₁-⁸⁰/₇ ⁸/₂₁-¹⁶/₃₅ ⁵⁶/₂₁-¹⁶/₇ ⁸/₂₁-¹⁶/₄₉

Subtract Fractions Calculator