Subtract 21/45 from 25/72
25/72 - 21/45 is -43/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 45 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
25/72 = 25 × 5/72 × 5 = 125/360 - Likewise, for the 2nd fraction, since 45 × 8 = 360,
21/45 = 21 × 8/45 × 8 = 168/360 - Subtract the two like fractions:
125/360 - 168/360 = 125 - 168/360 = -43/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/72-21/45 25/72-42/45 25/72-21/90 75/72-21/45 25/72-63/45