Subtract 18/72 from 70/42
1st number: 1 28/42, 2nd number: 18/72
70/42 - 18/72 is 17/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 42 × 12 = 504,
70/42 = 70 × 12/42 × 12 = 840/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
18/72 = 18 × 7/72 × 7 = 126/504 - Subtract the two like fractions:
840/504 - 126/504 = 840 - 126/504 = 714/504 - After reducing the fraction, the answer is 17/12
- In mixed form: 15/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42-36/72 70/84-18/72 70/42-54/72 70/42-90/72