Subtract 42/20 from 3/90
1st number: 3/90, 2nd number: 2 2/20
3/90 - 42/20 is -31/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
3/90 = 3 × 2/90 × 2 = 6/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
42/20 = 42 × 9/20 × 9 = 378/180 - Subtract the two like fractions:
6/180 - 378/180 = 6 - 378/180 = -372/180 - After reducing the fraction, the answer is -31/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/90-42/20 3/90-84/20 3/90-42/40 9/90-42/20 3/90-42/60 15/90-42/20 21/90-42/20