Subtract 21/8 from 21/45
1st number: 21/45, 2nd number: 2 5/8
21/45 - 21/8 is -259/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 8 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 8 × 45 = 360,
21/8 = 21 × 45/8 × 45 = 945/360 - Subtract the two like fractions:
168/360 - 945/360 = 168 - 945/360 = -777/360 - After reducing the fraction, the answer is -259/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45-21/8 21/45-42/8 21/90-21/8 21/45-21/16 63/45-21/8 21/45-63/8 21/45-21/24 21/45-21/40 21/45-21/56