Subtract 4/5 from 8/90
8/90 - 4/5 is -32/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 5 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
8/90 = 8 × 1/90 × 1 = 8/90 - Likewise, for the 2nd fraction, since 5 × 18 = 90,
4/5 = 4 × 18/5 × 18 = 72/90 - Subtract the two like fractions:
8/90 - 72/90 = 8 - 72/90 = -64/90 - After reducing the fraction, the answer is -32/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/90-4/5 8/90-8/5 8/90-4/10 24/90-4/5 8/90-12/5 8/90-4/15 40/90-4/5 8/90-20/5 8/90-4/25 56/90-4/5 8/90-28/5 8/90-4/35