Subtract 1/90 from 40/30
1st number: 1 10/30, 2nd number: 1/90
40/30 - 1/90 is 119/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
40/30 = 40 × 3/30 × 3 = 120/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
1/90 = 1 × 1/90 × 1 = 1/90 - Subtract the two like fractions:
120/90 - 1/90 = 120 - 1/90 = 119/90 - In mixed form: 129/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/30-1/90 40/30-2/90 40/60-1/90 40/30-3/90 40/90-1/90 40/30-5/90 40/30-7/90