Subtract 7/5 from 42/84
1st number: 42/84, 2nd number: 1 2/5
42/84 - 7/5 is -9/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 5 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
42/84 = 42 × 5/84 × 5 = 210/420 - Likewise, for the 2nd fraction, since 5 × 84 = 420,
7/5 = 7 × 84/5 × 84 = 588/420 - Subtract the two like fractions:
210/420 - 588/420 = 210 - 588/420 = -378/420 - After reducing the fraction, the answer is -9/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84-14/5 42/84-7/10 42/84-21/5 42/84-7/15 42/84-35/5 42/84-7/25 42/84-49/5 42/84-7/35