Subtract 2/40 from 1/90
1/90 - 2/40 is -7/180.
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,
1/90 = 1 × 4/90 × 4 = 4/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
2/40 = 2 × 9/40 × 9 = 18/360 - Subtract the two like fractions:
4/360 - 18/360 = 4 - 18/360 = -14/360 - After reducing the fraction, the answer is -7/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/90-2/40 1/90-4/40 1/90-2/80 3/90-2/40 1/90-6/40 5/90-2/40 1/90-10/40 7/90-2/40 1/90-14/40