Subtract 42/30 from 1/20
1st number: 1/20, 2nd number: 1 12/30
1/20 - 42/30 is -27/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
1/20 = 1 × 3/20 × 3 = 3/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
42/30 = 42 × 2/30 × 2 = 84/60 - Subtract the two like fractions:
3/60 - 84/60 = 3 - 84/60 = -81/60 - After reducing the fraction, the answer is -27/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/20-42/30 1/20-84/30 1/40-42/30 1/20-42/60 3/20-42/30 1/60-42/30 1/20-42/90 5/20-42/30 7/20-42/30