Subtract 30/25 from 20/72
1st number: 20/72, 2nd number: 1 5/25
20/72 - 30/25 is -83/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 25 is 1800
Next, find the equivalent fraction of both fractional numbers with denominator 1800 - For the 1st fraction, since 72 × 25 = 1800,
20/72 = 20 × 25/72 × 25 = 500/1800 - Likewise, for the 2nd fraction, since 25 × 72 = 1800,
30/25 = 30 × 72/25 × 72 = 2160/1800 - Subtract the two like fractions:
500/1800 - 2160/1800 = 500 - 2160/1800 = -1660/1800 - After reducing the fraction, the answer is -83/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/72-30/25 20/72-60/25 20/72-30/50 60/72-30/25 20/72-90/25 20/72-30/75