Subtract 84/24 from 21/45
1st number: 21/45, 2nd number: 3 12/24
21/45 - 84/24 is -91/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 24 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 45 × 8 = 360,
21/45 = 21 × 8/45 × 8 = 168/360 - Likewise, for the 2nd fraction, since 24 × 15 = 360,
84/24 = 84 × 15/24 × 15 = 1260/360 - Subtract the two like fractions:
168/360 - 1260/360 = 168 - 1260/360 = -1092/360 - After reducing the fraction, the answer is -91/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45-84/24 21/90-84/24 21/45-84/48 63/45-84/24 21/45-84/72