Subtract 20/7 from 18/4
1st number: 4 2/4, 2nd number: 2 6/7
18/4 - 20/7 is 23/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 7 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 4 × 7 = 28,
18/4 = 18 × 7/4 × 7 = 126/28 - Likewise, for the 2nd fraction, since 7 × 4 = 28,
20/7 = 20 × 4/7 × 4 = 80/28 - Subtract the two like fractions:
126/28 - 80/28 = 126 - 80/28 = 46/28 - After reducing the fraction, the answer is 23/14
- In mixed form: 19/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/4-20/7 18/4-40/7 18/8-20/7 18/4-20/14 54/4-20/7 18/4-60/7 18/12-20/7 18/4-20/21 90/4-20/7 18/20-20/7 18/4-20/35 18/28-20/7 18/4-20/49