Subtract 18/20 from 48/42
1st number: 1 6/42, 2nd number: 18/20
48/42 - 18/20 is 17/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
48/42 = 48 × 10/42 × 10 = 480/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
18/20 = 18 × 21/20 × 21 = 378/420 - Subtract the two like fractions:
480/420 - 378/420 = 480 - 378/420 = 102/420 - After reducing the fraction, the answer is 17/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 96/42-18/20 48/42-36/20 48/84-18/20 48/42-18/40 48/42-54/20 48/42-18/60 48/42-90/20