Answers

Subtract 63/40 from 21/98

1^st number: 21/98, 2^nd number: 1 23/40

21/98 - 63/40 is -381/280.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 98 and 40 is 1960
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1960
2. For the 1st fraction, since 98 × 20 = 1960,
   21/98 = 21 × 20/98 × 20 = 420/1960
3. Likewise, for the 2nd fraction, since 40 × 49 = 1960,
   63/40 = 63 × 49/40 × 49 = 3087/1960
4. Subtract the two like fractions:
   420/1960 - 3087/1960 = 420 - 3087/1960 = -2667/1960
5. After reducing the fraction, the answer is -381/280

MathStep (Works offline)

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

Related: ⁴²/₉₈-⁶³/₄₀ ²¹/₉₈-⁶³/₈₀ ⁶³/₉₈-⁶³/₄₀

Subtract Fractions Calculator