Subtract 18/80 from 7/4
1st number: 1 3/4, 2nd number: 18/80
7/4 - 18/80 is 61/40.
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,
7/4 = 7 × 20/4 × 20 = 140/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
18/80 = 18 × 1/80 × 1 = 18/80 - Subtract the two like fractions:
140/80 - 18/80 = 140 - 18/80 = 122/80 - After reducing the fraction, the answer is 61/40
- In mixed form: 121/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/4-18/80 7/4-36/80 7/8-18/80 21/4-18/80 7/4-54/80 7/12-18/80 35/4-18/80 7/4-90/80 7/20-18/80 49/4-18/80 7/28-18/80