Add 4/42 and 21/8
1st number: 4/42, 2nd number: 2 5/8
4/42 + 21/8 is 457/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
4/42 = 4 × 4/42 × 4 = 16/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
21/8 = 21 × 21/8 × 21 = 441/168 - Add the two like fractions:
16/168 + 441/168 = 16 + 441/168 = 457/168 - So, 4/42 + 21/8 = 457/168
In mixed form: 2121/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/42+21/8 4/42+42/8 4/84+21/8 4/42+21/16 12/42+21/8 4/42+63/8 4/42+21/24 20/42+21/8 4/42+21/40 28/42+21/8 4/42+21/56