Answers

Subtract 21/81 from 42/4

1^st number: 10 2/4, 2^nd number: 21/81

42/4 - 21/81 is 553/54.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 4 and 81 is 324
   
   Next, find the equivalent fraction of both fractional numbers with denominator 324
2. For the 1st fraction, since 4 × 81 = 324,
   42/4 = 42 × 81/4 × 81 = 3402/324
3. Likewise, for the 2nd fraction, since 81 × 4 = 324,
   21/81 = 21 × 4/81 × 4 = 84/324
4. Subtract the two like fractions:
   3402/324 - 84/324 = 3402 - 84/324 = 3318/324
5. After reducing the fraction, the answer is 553/54
6. In mixed form: 1013/54

MathStep (Works offline)

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

Related: ⁸⁴/₄-²¹/₈₁ ⁴²/₄-⁴²/₈₁ ⁴²/₈-²¹/₈₁ ⁴²/₄-⁶³/₈₁ ⁴²/₁₂-²¹/₈₁ ⁴²/₂₀-²¹/₈₁ ⁴²/₂₈-²¹/₈₁

Subtract Fractions Calculator