Answers

Subtract 63/98 from 81/40

1^st number: 2 1/40, 2^nd number: 63/98

81/40 - 63/98 is 387/280.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 98 is 1960
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1960
2. For the 1st fraction, since 40 × 49 = 1960,
   81/40 = 81 × 49/40 × 49 = 3969/1960
3. Likewise, for the 2nd fraction, since 98 × 20 = 1960,
   63/98 = 63 × 20/98 × 20 = 1260/1960
4. Subtract the two like fractions:
   3969/1960 - 1260/1960 = 3969 - 1260/1960 = 2709/1960
5. After reducing the fraction, the answer is 387/280
6. In mixed form: 1107/280

MathStep (Works offline)

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

Related: ⁸¹/₈₀-⁶³/₉₈

Subtract Fractions Calculator