Subtract 1/84 from 45/42
1st number: 1 3/42, 2nd number: 1/84
45/42 - 1/84 is 89/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
45/42 = 45 × 2/42 × 2 = 90/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
1/84 = 1 × 1/84 × 1 = 1/84 - Subtract the two like fractions:
90/84 - 1/84 = 90 - 1/84 = 89/84 - In mixed form: 15/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42-1/84 45/42-2/84 45/84-1/84 45/42-3/84 45/42-5/84 45/42-7/84