Subtract 5/20 from 45/70
45/70 - 5/20 is 11/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
45/70 = 45 × 2/70 × 2 = 90/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
5/20 = 5 × 7/20 × 7 = 35/140 - Subtract the two like fractions:
90/140 - 35/140 = 90 - 35/140 = 55/140 - After reducing the fraction, the answer is 11/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-5/20 45/70-10/20 45/70-5/40 45/70-15/20 45/70-5/60 45/70-25/20 45/70-35/20