Subtract 18/30 from 42/27
1st number: 1 15/27, 2nd number: 18/30
42/27 - 18/30 is 43/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 30 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 27 × 10 = 270,
42/27 = 42 × 10/27 × 10 = 420/270 - Likewise, for the 2nd fraction, since 30 × 9 = 270,
18/30 = 18 × 9/30 × 9 = 162/270 - Subtract the two like fractions:
420/270 - 162/270 = 420 - 162/270 = 258/270 - After reducing the fraction, the answer is 43/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/27-18/30 42/27-36/30 42/54-18/30 42/27-18/60 42/27-54/30 42/81-18/30 42/27-18/90 42/27-90/30