Subtract 1/40 from 7/90
7/90 - 1/40 is 19/360.
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,
7/90 = 7 × 4/90 × 4 = 28/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
1/40 = 1 × 9/40 × 9 = 9/360 - Subtract the two like fractions:
28/360 - 9/360 = 28 - 9/360 = 19/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/90-1/40 7/90-2/40 7/90-1/80 21/90-1/40 7/90-3/40 35/90-1/40 7/90-5/40 49/90-1/40 7/90-7/40