Subtract 18/42 from 45/24
1st number: 1 21/24, 2nd number: 18/42
45/24 - 18/42 is 81/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 42 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
45/24 = 45 × 7/24 × 7 = 315/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
18/42 = 18 × 4/42 × 4 = 72/168 - Subtract the two like fractions:
315/168 - 72/168 = 315 - 72/168 = 243/168 - After reducing the fraction, the answer is 81/56
- In mixed form: 125/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/24-18/42 45/24-36/42 45/48-18/42 45/24-18/84 45/24-54/42 45/72-18/42 45/24-90/42