Subtract 30/90 from 8/28
8/28 - 30/90 is -1/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 28 × 45 = 1260,
8/28 = 8 × 45/28 × 45 = 360/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
30/90 = 30 × 14/90 × 14 = 420/1260 - Subtract the two like fractions:
360/1260 - 420/1260 = 360 - 420/1260 = -60/1260 - After reducing the fraction, the answer is -1/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/28-30/90 8/28-60/90 8/56-30/90 24/28-30/90 8/84-30/90 40/28-30/90 56/28-30/90