Subtract 8/45 from 21/7
1st number: 3 0/7, 2nd number: 8/45
21/7 - 8/45 is 127/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 7 × 45 = 315,
21/7 = 21 × 45/7 × 45 = 945/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
8/45 = 8 × 7/45 × 7 = 56/315 - Subtract the two like fractions:
945/315 - 56/315 = 945 - 56/315 = 889/315 - After reducing the fraction, the answer is 127/45
- In mixed form: 237/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7-8/45 21/7-16/45 21/14-8/45 21/7-8/90 63/7-8/45 21/7-24/45 21/7-40/45 21/35-8/45 21/7-56/45 21/49-8/45