Subtract 21/27 from 70/7
1st number: 10 0/7, 2nd number: 21/27
70/7 - 21/27 is 83/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 27 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 7 × 27 = 189,
70/7 = 70 × 27/7 × 27 = 1890/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
21/27 = 21 × 7/27 × 7 = 147/189 - Subtract the two like fractions:
1890/189 - 147/189 = 1890 - 147/189 = 1743/189 - After reducing the fraction, the answer is 83/9
- In mixed form: 92/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/7-42/27 70/14-21/27 70/7-21/54 70/7-63/27 70/21-21/27 70/7-21/81 70/35-21/27 70/49-21/27