Subtract 8/10 from 28/84
28/84 - 8/10 is -7/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 10 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
28/84 = 28 × 5/84 × 5 = 140/420 - Likewise, for the 2nd fraction, since 10 × 42 = 420,
8/10 = 8 × 42/10 × 42 = 336/420 - Subtract the two like fractions:
140/420 - 336/420 = 140 - 336/420 = -196/420 - After reducing the fraction, the answer is -7/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/84-8/10 28/84-16/10 28/84-8/20 28/84-24/10 28/84-8/30 28/84-40/10 28/84-8/50 28/84-56/10 28/84-8/70