Subtract 42/9 from 80/30
1st number: 2 20/30, 2nd number: 4 6/9
80/30 - 42/9 is -2/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 9 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
80/30 = 80 × 3/30 × 3 = 240/90 - Likewise, for the 2nd fraction, since 9 × 10 = 90,
42/9 = 42 × 10/9 × 10 = 420/90 - Subtract the two like fractions:
240/90 - 420/90 = 240 - 420/90 = -180/90 - After reducing the fraction, the answer is -2/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/30-84/9 80/60-42/9 80/30-42/18 80/90-42/9 80/30-42/27 80/30-42/45 80/30-42/63