Subtract 9/8 from 20/84
1st number: 20/84, 2nd number: 1 1/8
20/84 - 9/8 is -149/168.
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,
20/84 = 20 × 2/84 × 2 = 40/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
9/8 = 9 × 21/8 × 21 = 189/168 - Subtract the two like fractions:
40/168 - 189/168 = 40 - 189/168 = -149/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/84-9/8 20/84-18/8 20/84-9/16 60/84-9/8 20/84-27/8 20/84-9/24 20/84-45/8 20/84-9/40 20/84-63/8 20/84-9/56