Subtract 10/9 from 72/42
1st number: 1 30/42, 2nd number: 1 1/9
72/42 - 10/9 is 38/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 9 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
72/42 = 72 × 3/42 × 3 = 216/126 - Likewise, for the 2nd fraction, since 9 × 14 = 126,
10/9 = 10 × 14/9 × 14 = 140/126 - Subtract the two like fractions:
216/126 - 140/126 = 216 - 140/126 = 76/126 - After reducing the fraction, the answer is 38/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/42-20/9 72/84-10/9 72/42-10/18 72/42-30/9 72/42-10/27 72/42-50/9 72/42-10/45 72/42-70/9 72/42-10/63