Subtract 20/42 from 15/5
1st number: 3 0/5, 2nd number: 20/42
15/5 - 20/42 is 53/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 5 × 42 = 210,
15/5 = 15 × 42/5 × 42 = 630/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
20/42 = 20 × 5/42 × 5 = 100/210 - Subtract the two like fractions:
630/210 - 100/210 = 630 - 100/210 = 530/210 - After reducing the fraction, the answer is 53/21
- In mixed form: 211/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/5-20/42 15/5-40/42 15/10-20/42 15/5-20/84 45/5-20/42 15/5-60/42 75/5-20/42 15/25-20/42 15/35-20/42