Subtract 18/45 from 7/4
1st number: 1 3/4, 2nd number: 18/45
7/4 - 18/45 is 27/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 4 × 45 = 180,
7/4 = 7 × 45/4 × 45 = 315/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
18/45 = 18 × 4/45 × 4 = 72/180 - Subtract the two like fractions:
315/180 - 72/180 = 315 - 72/180 = 243/180 - After reducing the fraction, the answer is 27/20
- In mixed form: 17/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/4-18/45 7/4-36/45 7/8-18/45 7/4-18/90 21/4-18/45 7/4-54/45 7/12-18/45 35/4-18/45 7/4-90/45 7/20-18/45 49/4-18/45 7/28-18/45