Subtract 18/28 from 9/40
9/40 - 18/28 is -117/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 28 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
9/40 = 9 × 7/40 × 7 = 63/280 - Likewise, for the 2nd fraction, since 28 × 10 = 280,
18/28 = 18 × 10/28 × 10 = 180/280 - Subtract the two like fractions:
63/280 - 180/280 = 63 - 180/280 = -117/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/40-18/28 9/40-36/28 9/80-18/28 9/40-18/56 27/40-18/28 9/40-54/28 9/40-18/84 45/40-18/28 9/40-90/28 63/40-18/28