Subtract 98/80 from 63/90
1st number: 63/90, 2nd number: 1 18/80
63/90 - 98/80 is -21/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 90 × 8 = 720,
63/90 = 63 × 8/90 × 8 = 504/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
98/80 = 98 × 9/80 × 9 = 882/720 - Subtract the two like fractions:
504/720 - 882/720 = 504 - 882/720 = -378/720 - After reducing the fraction, the answer is -21/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: