Subtract 5/42 from 30/20
1st number: 1 10/20, 2nd number: 5/42
30/20 - 5/42 is 29/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
30/20 = 30 × 21/20 × 21 = 630/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
5/42 = 5 × 10/42 × 10 = 50/420 - Subtract the two like fractions:
630/420 - 50/420 = 630 - 50/420 = 580/420 - After reducing the fraction, the answer is 29/21
- In mixed form: 18/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/20-5/42 30/20-10/42 30/40-5/42 30/20-5/84 90/20-5/42 30/20-15/42 30/60-5/42 30/20-25/42 30/20-35/42