Subtract 7/40 from 3/45
3/45 - 7/40 is -13/120.
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,
3/45 = 3 × 8/45 × 8 = 24/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
7/40 = 7 × 9/40 × 9 = 63/360 - Subtract the two like fractions:
24/360 - 63/360 = 24 - 63/360 = -39/360 - After reducing the fraction, the answer is -13/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/45-7/40 3/45-14/40 3/90-7/40 3/45-7/80 9/45-7/40 3/45-21/40 15/45-7/40 3/45-35/40 21/45-7/40 3/45-49/40