Subtract 70/21 from 1/27
1st number: 1/27, 2nd number: 3 7/21
1/27 - 70/21 is -89/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 21 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 27 × 7 = 189,
1/27 = 1 × 7/27 × 7 = 7/189 - Likewise, for the 2nd fraction, since 21 × 9 = 189,
70/21 = 70 × 9/21 × 9 = 630/189 - Subtract the two like fractions:
7/189 - 630/189 = 7 - 630/189 = -623/189 - After reducing the fraction, the answer is -89/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/27-70/21 1/54-70/21 1/27-70/42 3/27-70/21 1/81-70/21 1/27-70/63 5/27-70/21 7/27-70/21