Answers

Subtract 48/81 from 21/8

1^st number: 2 5/8, 2^nd number: 48/81

21/8 - 48/81 is 439/216.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 8 and 81 is 648
   
   Next, find the equivalent fraction of both fractional numbers with denominator 648
2. For the 1st fraction, since 8 × 81 = 648,
   21/8 = 21 × 81/8 × 81 = 1701/648
3. Likewise, for the 2nd fraction, since 81 × 8 = 648,
   48/81 = 48 × 8/81 × 8 = 384/648
4. Subtract the two like fractions:
   1701/648 - 384/648 = 1701 - 384/648 = 1317/648
5. After reducing the fraction, the answer is 439/216
6. In mixed form: 27/216

MathStep (Works offline)

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

Related: ⁴²/₈-⁴⁸/₈₁ ²¹/₈-⁹⁶/₈₁ ²¹/₁₆-⁴⁸/₈₁ ⁶³/₈-⁴⁸/₈₁ ²¹/₂₄-⁴⁸/₈₁ ²¹/₄₀-⁴⁸/₈₁ ²¹/₅₆-⁴⁸/₈₁

Subtract Fractions Calculator