Answers

Subtract 7/81 from 7/2

1^st number: 3 1/2, 2^nd number: 7/81

7/2 - 7/81 is 553/162.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 2 and 81 is 162
   
   Next, find the equivalent fraction of both fractional numbers with denominator 162
2. For the 1st fraction, since 2 × 81 = 162,
   7/2 = 7 × 81/2 × 81 = 567/162
3. Likewise, for the 2nd fraction, since 81 × 2 = 162,
   7/81 = 7 × 2/81 × 2 = 14/162
4. Subtract the two like fractions:
   567/162 - 14/162 = 567 - 14/162 = 553/162
5. In mixed form: 367/162

MathStep (Works offline)

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

Related: ¹⁴/₂-⁷/₈₁ ⁷/₂-¹⁴/₈₁ ⁷/₄-⁷/₈₁ ²¹/₂-⁷/₈₁ ⁷/₂-²¹/₈₁ ⁷/₆-⁷/₈₁ ³⁵/₂-⁷/₈₁ ⁷/₂-³⁵/₈₁ ⁷/₁₀-⁷/₈₁ ⁴⁹/₂-⁷/₈₁ ⁷/₂-⁴⁹/₈₁ ⁷/₁₄-⁷/₈₁

Subtract Fractions Calculator