Answers

Subtract 98/80 from 21/30

1^st number: 21/30, 2^nd number: 1 18/80

21/30 - 98/80 is -21/40.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 30 and 80 is 240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 240
2. For the 1st fraction, since 30 × 8 = 240,
   21/30 = 21 × 8/30 × 8 = 168/240
3. Likewise, for the 2nd fraction, since 80 × 3 = 240,
   98/80 = 98 × 3/80 × 3 = 294/240
4. Subtract the two like fractions:
   168/240 - 294/240 = 168 - 294/240 = -126/240
5. After reducing the fraction, the answer is -21/40

MathStep (Works offline)

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

Related: ⁴²/₃₀-⁹⁸/₈₀ ²¹/₆₀-⁹⁸/₈₀ ⁶³/₃₀-⁹⁸/₈₀ ²¹/₉₀-⁹⁸/₈₀

Subtract Fractions Calculator