Subtract 25/84 from 42/70
42/70 - 25/84 is 127/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 70 × 6 = 420,
42/70 = 42 × 6/70 × 6 = 252/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
25/84 = 25 × 5/84 × 5 = 125/420 - Subtract the two like fractions:
252/420 - 125/420 = 252 - 125/420 = 127/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/70-25/84 42/70-50/84 42/70-75/84