Subtract 7/9 from 30/40
30/40 - 7/9 is -1/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 9 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
30/40 = 30 × 9/40 × 9 = 270/360 - Likewise, for the 2nd fraction, since 9 × 40 = 360,
7/9 = 7 × 40/9 × 40 = 280/360 - Subtract the two like fractions:
270/360 - 280/360 = 270 - 280/360 = -10/360 - After reducing the fraction, the answer is -1/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/40-7/9 30/40-14/9 30/80-7/9 30/40-7/18 90/40-7/9 30/40-21/9 30/40-7/27 30/40-35/9 30/40-7/45 30/40-49/9 30/40-7/63