Subtract 30/8 from 28/84
1st number: 28/84, 2nd number: 3 6/8
28/84 - 30/8 is -41/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 84 × 2 = 168,
28/84 = 28 × 2/84 × 2 = 56/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
30/8 = 30 × 21/8 × 21 = 630/168 - Subtract the two like fractions:
56/168 - 630/168 = 56 - 630/168 = -574/168 - After reducing the fraction, the answer is -41/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/84-30/8 28/84-60/8 28/84-30/16 28/84-90/8 28/84-30/24 28/84-30/40 28/84-30/56