Subtract 45/42 from 72/75
1st number: 72/75, 2nd number: 1 3/42
72/75 - 45/42 is -39/350.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 42 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 75 × 14 = 1050,
72/75 = 72 × 14/75 × 14 = 1008/1050 - Likewise, for the 2nd fraction, since 42 × 25 = 1050,
45/42 = 45 × 25/42 × 25 = 1125/1050 - Subtract the two like fractions:
1008/1050 - 1125/1050 = 1008 - 1125/1050 = -117/1050 - After reducing the fraction, the answer is -39/350
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/75-90/42 72/75-45/84