Subtract 12/4 from 20/45
1st number: 20/45, 2nd number: 3 0/4
20/45 - 12/4 is -23/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 4 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
20/45 = 20 × 4/45 × 4 = 80/180 - Likewise, for the 2nd fraction, since 4 × 45 = 180,
12/4 = 12 × 45/4 × 45 = 540/180 - Subtract the two like fractions:
80/180 - 540/180 = 80 - 540/180 = -460/180 - After reducing the fraction, the answer is -23/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45-12/4 20/45-24/4 20/90-12/4 20/45-12/8 60/45-12/4 20/45-36/4 20/45-60/4 20/45-12/20 20/45-84/4 20/45-12/28