Subtract 42/10 from 28/90
1st number: 28/90, 2nd number: 4 2/10
28/90 - 42/10 is -35/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
28/90 = 28 × 1/90 × 1 = 28/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
42/10 = 42 × 9/10 × 9 = 378/90 - Subtract the two like fractions:
28/90 - 378/90 = 28 - 378/90 = -350/90 - After reducing the fraction, the answer is -35/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90-42/10 28/90-84/10 28/90-42/20 84/90-42/10 28/90-42/30 28/90-42/50 28/90-42/70