Subtract 28/42 from 8/90
8/90 - 28/42 is -26/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
8/90 = 8 × 7/90 × 7 = 56/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
28/42 = 28 × 15/42 × 15 = 420/630 - Subtract the two like fractions:
56/630 - 420/630 = 56 - 420/630 = -364/630 - After reducing the fraction, the answer is -26/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/90-28/42 8/90-56/42 8/90-28/84 24/90-28/42 8/90-84/42 40/90-28/42 56/90-28/42