Subtract 70/90 from 4/7
4/7 - 70/90 is -13/63.
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,
4/7 = 4 × 90/7 × 90 = 360/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
70/90 = 70 × 7/90 × 7 = 490/630 - Subtract the two like fractions:
360/630 - 490/630 = 360 - 490/630 = -130/630 - After reducing the fraction, the answer is -13/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/7-70/90 4/14-70/90 12/7-70/90 4/21-70/90 20/7-70/90 4/35-70/90 28/7-70/90 4/49-70/90