Subtract 63/8 from 90/84
1st number: 1 6/84, 2nd number: 7 7/8
90/84 - 63/8 is -381/56.
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,
90/84 = 90 × 2/84 × 2 = 180/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
63/8 = 63 × 21/8 × 21 = 1323/168 - Subtract the two like fractions:
180/168 - 1323/168 = 180 - 1323/168 = -1143/168 - After reducing the fraction, the answer is -381/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/84-63/16 90/84-63/24 90/84-63/40 90/84-63/56