Subtract 45/7 from 28/42
1st number: 28/42, 2nd number: 6 3/7
28/42 - 45/7 is -121/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 7 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
28/42 = 28 × 1/42 × 1 = 28/42 - Likewise, for the 2nd fraction, since 7 × 6 = 42,
45/7 = 45 × 6/7 × 6 = 270/42 - Subtract the two like fractions:
28/42 - 270/42 = 28 - 270/42 = -242/42 - After reducing the fraction, the answer is -121/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-45/7 28/42-90/7 28/84-45/7 28/42-45/14 84/42-45/7 28/42-45/21 28/42-45/35 28/42-45/49