Subtract 1/21 from 45/27
1st number: 1 18/27, 2nd number: 1/21
45/27 - 1/21 is 34/21.
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,
45/27 = 45 × 7/27 × 7 = 315/189 - Likewise, for the 2nd fraction, since 21 × 9 = 189,
1/21 = 1 × 9/21 × 9 = 9/189 - Subtract the two like fractions:
315/189 - 9/189 = 315 - 9/189 = 306/189 - After reducing the fraction, the answer is 34/21
- In mixed form: 113/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/27-1/21 45/27-2/21 45/54-1/21 45/27-1/42 45/27-3/21 45/81-1/21 45/27-1/63 45/27-5/21 45/27-7/21