Subtract 42/72 from 30/7
1st number: 4 2/7, 2nd number: 42/72
30/7 - 42/72 is 311/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 7 × 72 = 504,
30/7 = 30 × 72/7 × 72 = 2160/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
42/72 = 42 × 7/72 × 7 = 294/504 - Subtract the two like fractions:
2160/504 - 294/504 = 2160 - 294/504 = 1866/504 - After reducing the fraction, the answer is 311/84
- In mixed form: 359/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/7-42/72 30/7-84/72 30/14-42/72 90/7-42/72 30/21-42/72 30/35-42/72 30/49-42/72