Subtract 7/18 from 42/45
42/45 - 7/18 is 49/90.
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,
42/45 = 42 × 2/45 × 2 = 84/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
7/18 = 7 × 5/18 × 5 = 35/90 - Subtract the two like fractions:
84/90 - 35/90 = 84 - 35/90 = 49/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45-7/18 42/45-14/18 42/90-7/18 42/45-7/36 42/45-21/18 42/45-7/54 42/45-35/18 42/45-7/90 42/45-49/18