Subtract 5/21 from 40/60
40/60 - 5/21 is 3/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,
40/60 = 40 × 7/60 × 7 = 280/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
5/21 = 5 × 20/21 × 20 = 100/420 - Subtract the two like fractions:
280/420 - 100/420 = 280 - 100/420 = 180/420 - After reducing the fraction, the answer is 3/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/60-5/21 40/60-10/21 40/60-5/42 40/60-15/21 40/60-5/63 40/60-25/21 40/60-35/21