Subtract 60/21 from 45/80
1st number: 45/80, 2nd number: 2 18/21
45/80 - 60/21 is -257/112.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 21 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
45/80 = 45 × 21/80 × 21 = 945/1680 - Likewise, for the 2nd fraction, since 21 × 80 = 1680,
60/21 = 60 × 80/21 × 80 = 4800/1680 - Subtract the two like fractions:
945/1680 - 4800/1680 = 945 - 4800/1680 = -3855/1680 - After reducing the fraction, the answer is -257/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/80-60/21 45/80-60/42 45/80-60/63