Subtract 42/18 from 16/45
1st number: 16/45, 2nd number: 2 6/18
16/45 - 42/18 is -89/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
16/45 = 16 × 2/45 × 2 = 32/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
42/18 = 42 × 5/18 × 5 = 210/90 - Subtract the two like fractions:
32/90 - 210/90 = 32 - 210/90 = -178/90 - After reducing the fraction, the answer is -89/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/45-42/18 16/45-84/18 16/90-42/18 16/45-42/36 48/45-42/18 16/45-42/54 80/45-42/18 16/45-42/90