Subtract 4/40 from 7/45
7/45 - 4/40 is 1/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 45 × 8 = 360,
7/45 = 7 × 8/45 × 8 = 56/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
4/40 = 4 × 9/40 × 9 = 36/360 - Subtract the two like fractions:
56/360 - 36/360 = 56 - 36/360 = 20/360 - After reducing the fraction, the answer is 1/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/45-4/40 7/45-8/40 7/90-4/40 7/45-4/80 21/45-4/40 7/45-12/40 35/45-4/40 7/45-20/40 49/45-4/40 7/45-28/40