Add 1/8 and 21/42
1/8 + 21/42 is 5/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 42 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
1/8 = 1 × 21/8 × 21 = 21/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
21/42 = 21 × 4/42 × 4 = 84/168 - Add the two like fractions:
21/168 + 84/168 = 21 + 84/168 = 105/168 - 105/168 simplified gives 5/8
- So, 1/8 + 21/42 = 5/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/8+21/42 1/16+21/42 1/8+21/84 3/8+21/42 1/8+63/42 1/24+21/42 5/8+21/42 1/40+21/42 7/8+21/42 1/56+21/42