Subtract 8/45 from 4/40
4/40 - 8/45 is -7/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 45 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
4/40 = 4 × 9/40 × 9 = 36/360 - Likewise, for the 2nd fraction, since 45 × 8 = 360,
8/45 = 8 × 8/45 × 8 = 64/360 - Subtract the two like fractions:
36/360 - 64/360 = 36 - 64/360 = -28/360 - After reducing the fraction, the answer is -7/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/40-8/45 4/40-16/45 4/80-8/45 4/40-8/90 12/40-8/45 4/40-24/45 20/40-8/45 4/40-40/45 28/40-8/45 4/40-56/45