Subtract 7/30 from 20/45
20/45 - 7/30 is 19/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
20/45 = 20 × 2/45 × 2 = 40/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
7/30 = 7 × 3/30 × 3 = 21/90 - Subtract the two like fractions:
40/90 - 21/90 = 40 - 21/90 = 19/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45-7/30 20/45-14/30 20/90-7/30 20/45-7/60 60/45-7/30 20/45-21/30 20/45-7/90 20/45-35/30 20/45-49/30