Subtract 10/45 from 21/72
21/72 - 10/45 is 5/72.
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,
21/72 = 21 × 5/72 × 5 = 105/360 - Likewise, for the 2nd fraction, since 45 × 8 = 360,
10/45 = 10 × 8/45 × 8 = 80/360 - Subtract the two like fractions:
105/360 - 80/360 = 105 - 80/360 = 25/360 - After reducing the fraction, the answer is 5/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72-10/45 21/72-20/45 21/72-10/90 63/72-10/45 21/72-30/45 21/72-50/45 21/72-70/45