Subtract 4/81 from 45/21
1st number: 2 3/21, 2nd number: 4/81
45/21 - 4/81 is 1187/567.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 21 × 27 = 567,
45/21 = 45 × 27/21 × 27 = 1215/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
4/81 = 4 × 7/81 × 7 = 28/567 - Subtract the two like fractions:
1215/567 - 28/567 = 1215 - 28/567 = 1187/567 - In mixed form: 253/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-4/81 45/21-8/81 45/42-4/81 45/21-12/81 45/63-4/81 45/21-20/81 45/21-28/81