Subtract 2/72 from 21/20
1st number: 1 1/20, 2nd number: 2/72
21/20 - 2/72 is 46/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 20 × 18 = 360,
21/20 = 21 × 18/20 × 18 = 378/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
2/72 = 2 × 5/72 × 5 = 10/360 - Subtract the two like fractions:
378/360 - 10/360 = 378 - 10/360 = 368/360 - After reducing the fraction, the answer is 46/45
- In mixed form: 11/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20-2/72 21/20-4/72 21/40-2/72 63/20-2/72 21/20-6/72 21/60-2/72 21/20-10/72 21/20-14/72