Subtract 36/42 from 7/28
7/28 - 36/42 is -17/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
7/28 = 7 × 3/28 × 3 = 21/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
36/42 = 36 × 2/42 × 2 = 72/84 - Subtract the two like fractions:
21/84 - 72/84 = 21 - 72/84 = -51/84 - After reducing the fraction, the answer is -17/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/28-36/42 7/28-72/42 7/56-36/42 7/28-36/84 21/28-36/42 7/84-36/42 35/28-36/42 49/28-36/42