Subtract 45/21 from 1/5
1st number: 1/5, 2nd number: 2 3/21
1/5 - 45/21 is -68/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
1/5 = 1 × 21/5 × 21 = 21/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
45/21 = 45 × 5/21 × 5 = 225/105 - Subtract the two like fractions:
21/105 - 225/105 = 21 - 225/105 = -204/105 - After reducing the fraction, the answer is -68/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/5-45/21 1/5-90/21 1/10-45/21 1/5-45/42 3/5-45/21 1/15-45/21 1/5-45/63 1/25-45/21 7/5-45/21 1/35-45/21