Subtract 9/40 from 18/98
18/98 - 9/40 is -81/1960.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 98 and 40 is 1960
Next, find the equivalent fraction of both fractional numbers with denominator 1960 - For the 1st fraction, since 98 × 20 = 1960,
18/98 = 18 × 20/98 × 20 = 360/1960 - Likewise, for the 2nd fraction, since 40 × 49 = 1960,
9/40 = 9 × 49/40 × 49 = 441/1960 - Subtract the two like fractions:
360/1960 - 441/1960 = 360 - 441/1960 = -81/1960
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/98-9/40 18/98-18/40 18/98-9/80 54/98-9/40 18/98-27/40 90/98-9/40 18/98-45/40 18/98-63/40