Subtract 3/90 from 42/30
1st number: 1 12/30, 2nd number: 3/90
42/30 - 3/90 is 41/30.
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,
42/30 = 42 × 3/30 × 3 = 126/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
3/90 = 3 × 1/90 × 1 = 3/90 - Subtract the two like fractions:
126/90 - 3/90 = 126 - 3/90 = 123/90 - After reducing the fraction, the answer is 41/30
- In mixed form: 111/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30-3/90 42/30-6/90 42/60-3/90 42/30-9/90 42/90-3/90 42/30-15/90 42/30-21/90