Subtract 1/90 from 42/27
1st number: 1 15/27, 2nd number: 1/90
42/27 - 1/90 is 139/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 90 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 90 × 3 = 270,
1/90 = 1 × 3/90 × 3 = 3/270 - Subtract the two like fractions:
420/270 - 3/270 = 420 - 3/270 = 417/270 - After reducing the fraction, the answer is 139/90
- In mixed form: 149/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/27-1/90 42/27-2/90 42/54-1/90 42/27-3/90 42/81-1/90 42/27-5/90 42/27-7/90