Answers

Subtract 42/45 from 21/98

21/98 - 42/45 is -151/210.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 98 and 45 is 4410
   
   Next, find the equivalent fraction of both fractional numbers with denominator 4410
2. For the 1st fraction, since 98 × 45 = 4410,
   21/98 = 21 × 45/98 × 45 = 945/4410
3. Likewise, for the 2nd fraction, since 45 × 98 = 4410,
   42/45 = 42 × 98/45 × 98 = 4116/4410
4. Subtract the two like fractions:
   945/4410 - 4116/4410 = 945 - 4116/4410 = -3171/4410
5. After reducing the fraction, the answer is -151/210

MathStep (Works offline)

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

Related: ⁴²/₉₈-⁴²/₄₅ ²¹/₉₈-⁸⁴/₄₅ ²¹/₉₈-⁴²/₉₀ ⁶³/₉₈-⁴²/₄₅

Subtract Fractions Calculator