Subtract 3/18 from 45/42
1st number: 1 3/42, 2nd number: 3/18
45/42 - 3/18 is 19/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
45/42 = 45 × 3/42 × 3 = 135/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
3/18 = 3 × 7/18 × 7 = 21/126 - Subtract the two like fractions:
135/126 - 21/126 = 135 - 21/126 = 114/126 - After reducing the fraction, the answer is 19/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42-3/18 45/42-6/18 45/84-3/18 45/42-3/36 45/42-9/18 45/42-3/54 45/42-15/18 45/42-3/90 45/42-21/18