Subtract 7/45 from 21/8
1st number: 2 5/8, 2nd number: 7/45
21/8 - 7/45 is 889/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 45 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 8 × 45 = 360,
21/8 = 21 × 45/8 × 45 = 945/360 - Likewise, for the 2nd fraction, since 45 × 8 = 360,
7/45 = 7 × 8/45 × 8 = 56/360 - Subtract the two like fractions:
945/360 - 56/360 = 945 - 56/360 = 889/360 - In mixed form: 2169/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-7/45 21/8-14/45 21/16-7/45 21/8-7/90 63/8-7/45 21/8-21/45 21/24-7/45 21/8-35/45 21/40-7/45 21/8-49/45 21/56-7/45