Subtract 21/72 from 9/10
9/10 - 21/72 is 73/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 10 × 36 = 360,
9/10 = 9 × 36/10 × 36 = 324/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
21/72 = 21 × 5/72 × 5 = 105/360 - Subtract the two like fractions:
324/360 - 105/360 = 324 - 105/360 = 219/360 - After reducing the fraction, the answer is 73/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/10-21/72 9/10-42/72 9/20-21/72 27/10-21/72 9/10-63/72 9/30-21/72 45/10-21/72 9/50-21/72 63/10-21/72 9/70-21/72