Subtract 2/5 from 12/90
12/90 - 2/5 is -4/15.
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,
12/90 = 12 × 1/90 × 1 = 12/90 - Likewise, for the 2nd fraction, since 5 × 18 = 90,
2/5 = 2 × 18/5 × 18 = 36/90 - Subtract the two like fractions:
12/90 - 36/90 = 12 - 36/90 = -24/90 - After reducing the fraction, the answer is -4/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/90-2/5 12/90-4/5 12/90-2/10 36/90-2/5 12/90-6/5 12/90-2/15 60/90-2/5 12/90-10/5 12/90-2/25 84/90-2/5 12/90-14/5 12/90-2/35