Subtract 4/10 from 20/45
20/45 - 4/10 is 2/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 10 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 10 × 9 = 90,
4/10 = 4 × 9/10 × 9 = 36/90 - Subtract the two like fractions:
40/90 - 36/90 = 40 - 36/90 = 4/90 - After reducing the fraction, the answer is 2/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45-4/10 20/45-8/10 20/90-4/10 20/45-4/20 60/45-4/10 20/45-12/10 20/45-4/30 20/45-20/10 20/45-4/50 20/45-28/10 20/45-4/70