Subtract 75/30 from 21/5
1st number: 4 1/5, 2nd number: 2 15/30
21/5 - 75/30 is 17/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 30 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 5 × 6 = 30,
21/5 = 21 × 6/5 × 6 = 126/30 - Likewise, for the 2nd fraction, since 30 × 1 = 30,
75/30 = 75 × 1/30 × 1 = 75/30 - Subtract the two like fractions:
126/30 - 75/30 = 126 - 75/30 = 51/30 - After reducing the fraction, the answer is 17/10
- In mixed form: 17/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5-75/30 21/10-75/30 21/5-75/60 63/5-75/30 21/15-75/30 21/5-75/90 21/25-75/30 21/35-75/30