Subtract 45/10 from 21/45
1st number: 21/45, 2nd number: 4 5/10
21/45 - 45/10 is -121/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
21/45 = 21 × 2/45 × 2 = 42/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
45/10 = 45 × 9/10 × 9 = 405/90 - Subtract the two like fractions:
42/90 - 405/90 = 42 - 405/90 = -363/90 - After reducing the fraction, the answer is -121/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45-45/10 21/45-90/10 21/90-45/10 21/45-45/20 63/45-45/10 21/45-45/30 21/45-45/50 21/45-45/70