Subtract 21/90 from 84/54
1st number: 1 30/54, 2nd number: 21/90
84/54 - 21/90 is 119/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 90 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 54 × 5 = 270,
84/54 = 84 × 5/54 × 5 = 420/270 - Likewise, for the 2nd fraction, since 90 × 3 = 270,
21/90 = 21 × 3/90 × 3 = 63/270 - Subtract the two like fractions:
420/270 - 63/270 = 420 - 63/270 = 357/270 - After reducing the fraction, the answer is 119/90
- In mixed form: 129/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/54-42/90 84/54-63/90