Subtract 4/40 from 3/9
3/9 - 4/40 is 7/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 9 × 40 = 360,
3/9 = 3 × 40/9 × 40 = 120/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
4/40 = 4 × 9/40 × 9 = 36/360 - Subtract the two like fractions:
120/360 - 36/360 = 120 - 36/360 = 84/360 - After reducing the fraction, the answer is 7/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/9-4/40 3/9-8/40 3/18-4/40 3/9-4/80 3/9-12/40 3/27-4/40 15/9-4/40 3/9-20/40 3/45-4/40 21/9-4/40 3/9-28/40 3/63-4/40