Subtract 45/10 from 21/18
1st number: 1 3/18, 2nd number: 4 5/10
21/18 - 45/10 is -10/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
21/18 = 21 × 5/18 × 5 = 105/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
45/10 = 45 × 9/10 × 9 = 405/90 - Subtract the two like fractions:
105/90 - 405/90 = 105 - 405/90 = -300/90 - After reducing the fraction, the answer is -10/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-45/10 21/18-90/10 21/36-45/10 21/18-45/20 63/18-45/10 21/54-45/10 21/18-45/30 21/90-45/10 21/18-45/50 21/18-45/70