Subtract 70/63 from 30/72
1st number: 30/72, 2nd number: 1 7/63
30/72 - 70/63 is -25/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 63 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
30/72 = 30 × 7/72 × 7 = 210/504 - Likewise, for the 2nd fraction, since 63 × 8 = 504,
70/63 = 70 × 8/63 × 8 = 560/504 - Subtract the two like fractions:
210/504 - 560/504 = 210 - 560/504 = -350/504 - After reducing the fraction, the answer is -25/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/72-70/63 90/72-70/63