Subtract 21/80 from 35/45
35/45 - 21/80 is 371/720.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 45 × 16 = 720,
35/45 = 35 × 16/45 × 16 = 560/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
21/80 = 21 × 9/80 × 9 = 189/720 - Subtract the two like fractions:
560/720 - 189/720 = 560 - 189/720 = 371/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/45-21/80 35/45-42/80 35/90-21/80 35/45-63/80