Subtract 3/40 from 45/75
45/75 - 3/40 is 21/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 40 is 600
Next, find the equivalent fraction of both fractional numbers with denominator 600 - For the 1st fraction, since 75 × 8 = 600,
45/75 = 45 × 8/75 × 8 = 360/600 - Likewise, for the 2nd fraction, since 40 × 15 = 600,
3/40 = 3 × 15/40 × 15 = 45/600 - Subtract the two like fractions:
360/600 - 45/600 = 360 - 45/600 = 315/600 - After reducing the fraction, the answer is 21/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/75-3/40 45/75-6/40 45/75-3/80 45/75-9/40 45/75-15/40 45/75-21/40