Subtract 3/72 from 21/10
1st number: 2 1/10, 2nd number: 3/72
21/10 - 3/72 is 247/120.
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,
21/10 = 21 × 36/10 × 36 = 756/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
3/72 = 3 × 5/72 × 5 = 15/360 - Subtract the two like fractions:
756/360 - 15/360 = 756 - 15/360 = 741/360 - After reducing the fraction, the answer is 247/120
- In mixed form: 27/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10-3/72 21/10-6/72 21/20-3/72 63/10-3/72 21/10-9/72 21/30-3/72 21/10-15/72 21/50-3/72 21/10-21/72 21/70-3/72