Answers

Subtract 63/40 from 12/81

1^st number: 12/81, 2^nd number: 1 23/40

12/81 - 63/40 is -1541/1080.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 40 is 3240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 3240
2. For the 1st fraction, since 81 × 40 = 3240,
   12/81 = 12 × 40/81 × 40 = 480/3240
3. Likewise, for the 2nd fraction, since 40 × 81 = 3240,
   63/40 = 63 × 81/40 × 81 = 5103/3240
4. Subtract the two like fractions:
   480/3240 - 5103/3240 = 480 - 5103/3240 = -4623/3240
5. After reducing the fraction, the answer is -1541/1080

MathStep (Works offline)

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

Related: ²⁴/₈₁-⁶³/₄₀ ¹²/₈₁-⁶³/₈₀ ³⁶/₈₁-⁶³/₄₀ ⁶⁰/₈₁-⁶³/₄₀ ⁸⁴/₈₁-⁶³/₄₀

Subtract Fractions Calculator