Subtract 21/28 from 40/20
1st number: 2 0/20, 2nd number: 21/28
40/20 - 21/28 is 5/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
40/20 = 40 × 7/20 × 7 = 280/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
21/28 = 21 × 5/28 × 5 = 105/140 - Subtract the two like fractions:
280/140 - 105/140 = 280 - 105/140 = 175/140 - After reducing the fraction, the answer is 5/4
- In mixed form: 11/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/20-21/28 40/20-42/28 40/20-21/56 40/20-63/28 40/60-21/28 40/20-21/84