Subtract 90/8 from 70/40
1st number: 1 30/40, 2nd number: 11 2/8
70/40 - 90/8 is -19/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
70/40 = 70 × 1/40 × 1 = 70/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
90/8 = 90 × 5/8 × 5 = 450/40 - Subtract the two like fractions:
70/40 - 450/40 = 70 - 450/40 = -380/40 - After reducing the fraction, the answer is -19/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/80-90/8 70/40-90/16 70/40-90/24 70/40-90/40 70/40-90/56