Subtract 9/42 from 20/48
20/48 - 9/42 is 17/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 48 and 42 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 48 × 7 = 336,
20/48 = 20 × 7/48 × 7 = 140/336 - Likewise, for the 2nd fraction, since 42 × 8 = 336,
9/42 = 9 × 8/42 × 8 = 72/336 - Subtract the two like fractions:
140/336 - 72/336 = 140 - 72/336 = 68/336 - After reducing the fraction, the answer is 17/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/48-9/42 20/48-18/42 20/96-9/42 20/48-9/84 60/48-9/42 20/48-27/42 20/48-45/42 20/48-63/42