Subtract 10/80 from 21/45
21/45 - 10/80 is 41/120.
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,
21/45 = 21 × 16/45 × 16 = 336/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
10/80 = 10 × 9/80 × 9 = 90/720 - Subtract the two like fractions:
336/720 - 90/720 = 336 - 90/720 = 246/720 - After reducing the fraction, the answer is 41/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45-10/80 21/45-20/80 21/90-10/80 63/45-10/80 21/45-30/80 21/45-50/80 21/45-70/80