Subtract 70/80 from 63/18
1st number: 3 9/18, 2nd number: 70/80
63/18 - 70/80 is 21/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 18 × 40 = 720,
63/18 = 63 × 40/18 × 40 = 2520/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
70/80 = 70 × 9/80 × 9 = 630/720 - Subtract the two like fractions:
2520/720 - 630/720 = 2520 - 630/720 = 1890/720 - After reducing the fraction, the answer is 21/8
- In mixed form: 25/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/36-70/80 63/54-70/80 63/90-70/80