Subtract 5/40 from 21/49
21/49 - 5/40 is 17/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 40 is 1960
Next, find the equivalent fraction of both fractional numbers with denominator 1960 - For the 1st fraction, since 49 × 40 = 1960,
21/49 = 21 × 40/49 × 40 = 840/1960 - Likewise, for the 2nd fraction, since 40 × 49 = 1960,
5/40 = 5 × 49/40 × 49 = 245/1960 - Subtract the two like fractions:
840/1960 - 245/1960 = 840 - 245/1960 = 595/1960 - After reducing the fraction, the answer is 17/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/49-5/40 21/49-10/40 21/98-5/40 21/49-5/80 63/49-5/40 21/49-15/40 21/49-25/40 21/49-35/40