Subtract 4/90 from 7/30
7/30 - 4/90 is 17/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
7/30 = 7 × 3/30 × 3 = 21/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
4/90 = 4 × 1/90 × 1 = 4/90 - Subtract the two like fractions:
21/90 - 4/90 = 21 - 4/90 = 17/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/30-4/90 7/30-8/90 7/60-4/90 21/30-4/90 7/30-12/90 7/90-4/90 35/30-4/90 7/30-20/90 49/30-4/90 7/30-28/90