Subtract 15/30 from 72/42
1st number: 1 30/42, 2nd number: 15/30
72/42 - 15/30 is 17/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
72/42 = 72 × 5/42 × 5 = 360/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
15/30 = 15 × 7/30 × 7 = 105/210 - Subtract the two like fractions:
360/210 - 105/210 = 360 - 105/210 = 255/210 - After reducing the fraction, the answer is 17/14
- In mixed form: 13/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/84-15/30 72/42-15/60 72/42-45/30 72/42-15/90 72/42-75/30