Subtract 18/40 from 20/49
20/49 - 18/40 is -41/980.
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,
20/49 = 20 × 40/49 × 40 = 800/1960 - Likewise, for the 2nd fraction, since 40 × 49 = 1960,
18/40 = 18 × 49/40 × 49 = 882/1960 - Subtract the two like fractions:
800/1960 - 882/1960 = 800 - 882/1960 = -82/1960 - After reducing the fraction, the answer is -41/980
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/49-18/40 20/49-36/40 20/98-18/40 20/49-18/80 60/49-18/40 20/49-54/40 20/49-90/40