Subtract 45/4 from 90/70
1st number: 1 20/70, 2nd number: 11 1/4
90/70 - 45/4 is -279/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 4 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
90/70 = 90 × 2/70 × 2 = 180/140 - Likewise, for the 2nd fraction, since 4 × 35 = 140,
45/4 = 45 × 35/4 × 35 = 1575/140 - Subtract the two like fractions:
180/140 - 1575/140 = 180 - 1575/140 = -1395/140 - After reducing the fraction, the answer is -279/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-90/4 90/70-45/8 90/70-45/12 90/70-45/20 90/70-45/28