Subtract 42/9 from 20/30
1st number: 20/30, 2nd number: 4 6/9
20/30 - 42/9 is -4/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 9 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
20/30 = 20 × 3/30 × 3 = 60/90 - Likewise, for the 2nd fraction, since 9 × 10 = 90,
42/9 = 42 × 10/9 × 10 = 420/90 - Subtract the two like fractions:
60/90 - 420/90 = 60 - 420/90 = -360/90 - After reducing the fraction, the answer is -4/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/30-42/9 20/30-84/9 20/60-42/9 20/30-42/18 60/30-42/9 20/90-42/9 20/30-42/27 20/30-42/45 20/30-42/63