Subtract 7/40 from 2/90
2/90 - 7/40 is -11/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
2/90 = 2 × 4/90 × 4 = 8/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
7/40 = 7 × 9/40 × 9 = 63/360 - Subtract the two like fractions:
8/360 - 63/360 = 8 - 63/360 = -55/360 - After reducing the fraction, the answer is -11/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/90-7/40 2/90-14/40 2/90-7/80 6/90-7/40 2/90-21/40 10/90-7/40 2/90-35/40 14/90-7/40 2/90-49/40