Subtract 30/42 from 20/5
1st number: 4 0/5, 2nd number: 30/42
20/5 - 30/42 is 23/7.
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,
20/5 = 20 × 42/5 × 42 = 840/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
30/42 = 30 × 5/42 × 5 = 150/210 - Subtract the two like fractions:
840/210 - 150/210 = 840 - 150/210 = 690/210 - After reducing the fraction, the answer is 23/7
- In mixed form: 32/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/5-30/42 20/5-60/42 20/10-30/42 20/5-30/84 60/5-30/42 20/5-90/42 20/15-30/42 20/25-30/42 20/35-30/42