Add 20/42 and 45/48
20/42 + 45/48 is 475/336.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 48 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 42 × 8 = 336,
20/42 = 20 × 8/42 × 8 = 160/336 - Likewise, for the 2nd fraction, since 48 × 7 = 336,
45/48 = 45 × 7/48 × 7 = 315/336 - Add the two like fractions:
160/336 + 315/336 = 160 + 315/336 = 475/336 - So, 20/42 + 45/48 = 475/336
In mixed form: 1139/336
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42+45/48 20/42+90/48 20/84+45/48 20/42+45/96 60/42+45/48