Subtract 20/90 from 12/4
1st number: 3 0/4, 2nd number: 20/90
12/4 - 20/90 is 25/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 4 × 45 = 180,
12/4 = 12 × 45/4 × 45 = 540/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
20/90 = 20 × 2/90 × 2 = 40/180 - Subtract the two like fractions:
540/180 - 40/180 = 540 - 40/180 = 500/180 - After reducing the fraction, the answer is 25/9
- In mixed form: 27/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/4-20/90 12/4-40/90 12/8-20/90 36/4-20/90 12/4-60/90 60/4-20/90 12/20-20/90 84/4-20/90 12/28-20/90