Subtract 20/72 from 30/20
1st number: 1 10/20, 2nd number: 20/72
30/20 - 20/72 is 11/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 20 × 18 = 360,
30/20 = 30 × 18/20 × 18 = 540/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
20/72 = 20 × 5/72 × 5 = 100/360 - Subtract the two like fractions:
540/360 - 100/360 = 540 - 100/360 = 440/360 - After reducing the fraction, the answer is 11/9
- In mixed form: 12/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/20-20/72 30/20-40/72 30/40-20/72 90/20-20/72 30/20-60/72 30/60-20/72