Subtract 10/42 from 28/90
28/90 - 10/42 is 23/315.
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,
28/90 = 28 × 7/90 × 7 = 196/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
10/42 = 10 × 15/42 × 15 = 150/630 - Subtract the two like fractions:
196/630 - 150/630 = 196 - 150/630 = 46/630 - After reducing the fraction, the answer is 23/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90-10/42 28/90-20/42 28/90-10/84 84/90-10/42 28/90-30/42 28/90-50/42 28/90-70/42