Subtract 70/90 from 2/7
2/7 - 70/90 is -31/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 7 × 90 = 630,
2/7 = 2 × 90/7 × 90 = 180/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
70/90 = 70 × 7/90 × 7 = 490/630 - Subtract the two like fractions:
180/630 - 490/630 = 180 - 490/630 = -310/630 - After reducing the fraction, the answer is -31/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/7-70/90 2/14-70/90 6/7-70/90 2/21-70/90 10/7-70/90 2/35-70/90 14/7-70/90 2/49-70/90