Subtract 72/40 from 9/18
1st number: 9/18, 2nd number: 1 32/40
9/18 - 72/40 is -13/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 18 × 20 = 360,
9/18 = 9 × 20/18 × 20 = 180/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
72/40 = 72 × 9/40 × 9 = 648/360 - Subtract the two like fractions:
180/360 - 648/360 = 180 - 648/360 = -468/360 - After reducing the fraction, the answer is -13/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 9/36-72/40 9/18-72/80 27/18-72/40 9/54-72/40 45/18-72/40 9/90-72/40 63/18-72/40