Subtract 3/21 from 54/80
54/80 - 3/21 is 149/280.
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,
54/80 = 54 × 21/80 × 21 = 1134/1680 - Likewise, for the 2nd fraction, since 21 × 80 = 1680,
3/21 = 3 × 80/21 × 80 = 240/1680 - Subtract the two like fractions:
1134/1680 - 240/1680 = 1134 - 240/1680 = 894/1680 - After reducing the fraction, the answer is 149/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/80-6/21 54/80-3/42 54/80-9/21 54/80-3/63 54/80-15/21