Subtract 7/90 from 28/42
28/42 - 7/90 is 53/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
28/42 = 28 × 15/42 × 15 = 420/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
7/90 = 7 × 7/90 × 7 = 49/630 - Subtract the two like fractions:
420/630 - 49/630 = 420 - 49/630 = 371/630 - After reducing the fraction, the answer is 53/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-7/90 28/42-14/90 28/84-7/90 84/42-7/90 28/42-21/90 28/42-35/90 28/42-49/90