Add 42/21 and 54/48
1st number: 2 0/21, 2nd number: 1 6/48
42/21 + 54/48 is 25/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 48 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 21 × 16 = 336,
42/21 = 42 × 16/21 × 16 = 672/336 - Likewise, for the 2nd fraction, since 48 × 7 = 336,
54/48 = 54 × 7/48 × 7 = 378/336 - Add the two like fractions:
672/336 + 378/336 = 672 + 378/336 = 1050/336 - 1050/336 simplified gives 25/8
- So, 42/21 + 54/48 = 25/8
In mixed form: 31/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+54/48 42/21+54/96 42/63+54/48