Subtract 10/8 from 70/90
1st number: 70/90, 2nd number: 1 2/8
70/90 - 10/8 is -17/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 8 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
70/90 = 70 × 4/90 × 4 = 280/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
10/8 = 10 × 45/8 × 45 = 450/360 - Subtract the two like fractions:
280/360 - 450/360 = 280 - 450/360 = -170/360 - After reducing the fraction, the answer is -17/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90-20/8 70/90-10/16 70/90-30/8 70/90-10/24 70/90-50/8 70/90-10/40 70/90-70/8 70/90-10/56