Subtract 4/80 from 72/21
1st number: 3 9/21, 2nd number: 4/80
72/21 - 4/80 is 473/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
72/21 = 72 × 80/21 × 80 = 5760/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
4/80 = 4 × 21/80 × 21 = 84/1680 - Subtract the two like fractions:
5760/1680 - 84/1680 = 5760 - 84/1680 = 5676/1680 - After reducing the fraction, the answer is 473/140
- In mixed form: 353/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21-8/80 72/42-4/80 72/21-12/80 72/63-4/80 72/21-20/80 72/21-28/80