Subtract 21/16 from 7/45
1st number: 7/45, 2nd number: 1 5/16
7/45 - 21/16 is -833/720.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 16 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 45 × 16 = 720,
7/45 = 7 × 16/45 × 16 = 112/720 - Likewise, for the 2nd fraction, since 16 × 45 = 720,
21/16 = 21 × 45/16 × 45 = 945/720 - Subtract the two like fractions:
112/720 - 945/720 = 112 - 945/720 = -833/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/45-21/16 7/45-42/16 7/90-21/16 7/45-21/32 21/45-21/16 7/45-63/16 7/45-21/48 35/45-21/16 7/45-21/80 49/45-21/16