Subtract 1/42 from 90/12
1st number: 7 6/12, 2nd number: 1/42
90/12 - 1/42 is 157/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
90/12 = 90 × 7/12 × 7 = 630/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
1/42 = 1 × 2/42 × 2 = 2/84 - Subtract the two like fractions:
630/84 - 2/84 = 630 - 2/84 = 628/84 - After reducing the fraction, the answer is 157/21
- In mixed form: 710/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-2/42 90/24-1/42 90/12-1/84 90/12-3/42 90/36-1/42 90/12-5/42 90/60-1/42 90/12-7/42 90/84-1/42