Subtract 36/81 from 70/42
1st number: 1 28/42, 2nd number: 36/81
70/42 - 36/81 is 11/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 81 is 1134
Next, find the equivalent fraction of both fractional numbers with denominator 1134 - For the 1st fraction, since 42 × 27 = 1134,
70/42 = 70 × 27/42 × 27 = 1890/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
36/81 = 36 × 14/81 × 14 = 504/1134 - Subtract the two like fractions:
1890/1134 - 504/1134 = 1890 - 504/1134 = 1386/1134 - After reducing the fraction, the answer is 11/9
- In mixed form: 12/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42-72/81 70/84-36/81