Subtract 20/4 from 70/90
1st number: 70/90, 2nd number: 5 0/4
70/90 - 20/4 is -38/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 4 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
70/90 = 70 × 2/90 × 2 = 140/180 - Likewise, for the 2nd fraction, since 4 × 45 = 180,
20/4 = 20 × 45/4 × 45 = 900/180 - Subtract the two like fractions:
140/180 - 900/180 = 140 - 900/180 = -760/180 - After reducing the fraction, the answer is -38/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90-40/4 70/90-20/8 70/90-60/4 70/90-20/12 70/90-20/28