Subtract 12/20 from 72/45
1st number: 1 27/45, 2nd number: 12/20
72/45 - 12/20 is 1/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
72/45 = 72 × 4/45 × 4 = 288/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
12/20 = 12 × 9/20 × 9 = 108/180 - Subtract the two like fractions:
288/180 - 108/180 = 288 - 108/180 = 180/180 - After reducing the fraction, the answer is 1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/45-24/20 72/90-12/20 72/45-12/40 72/45-36/20 72/45-12/60 72/45-60/20 72/45-84/20