Subtract 2/70 from 28/90
28/90 - 2/70 is 89/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 70 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 70 × 9 = 630,
2/70 = 2 × 9/70 × 9 = 18/630 - Subtract the two like fractions:
196/630 - 18/630 = 196 - 18/630 = 178/630 - After reducing the fraction, the answer is 89/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90-2/70 28/90-4/70 84/90-2/70 28/90-6/70 28/90-10/70 28/90-14/70