Subtract 45/10 from 90/70
1st number: 1 20/70, 2nd number: 4 5/10
90/70 - 45/10 is -45/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 10 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 70 × 1 = 70,
90/70 = 90 × 1/70 × 1 = 90/70 - Likewise, for the 2nd fraction, since 10 × 7 = 70,
45/10 = 45 × 7/10 × 7 = 315/70 - Subtract the two like fractions:
90/70 - 315/70 = 90 - 315/70 = -225/70 - After reducing the fraction, the answer is -45/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-90/10 90/70-45/20 90/70-45/30 90/70-45/50 90/70-45/70