Subtract 9/8 from 45/84
1st number: 45/84, 2nd number: 1 1/8
45/84 - 9/8 is -33/56.
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,
45/84 = 45 × 2/84 × 2 = 90/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
9/8 = 9 × 21/8 × 21 = 189/168 - Subtract the two like fractions:
90/168 - 189/168 = 90 - 189/168 = -99/168 - After reducing the fraction, the answer is -33/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/84-9/8 45/84-18/8 45/84-9/16 45/84-27/8 45/84-9/24 45/84-45/8 45/84-9/40 45/84-63/8 45/84-9/56