Subtract 90/80 from 30/4
1st number: 7 2/4, 2nd number: 1 10/80
30/4 - 90/80 is 51/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 4 × 20 = 80,
30/4 = 30 × 20/4 × 20 = 600/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
90/80 = 90 × 1/80 × 1 = 90/80 - Subtract the two like fractions:
600/80 - 90/80 = 600 - 90/80 = 510/80 - After reducing the fraction, the answer is 51/8
- In mixed form: 63/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/4-90/80 30/8-90/80 90/4-90/80 30/12-90/80 30/20-90/80 30/28-90/80