Add 8/21 and 1/42
8/21 + 1/42 is 17/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
8/21 = 8 × 2/21 × 2 = 16/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
1/42 = 1 × 1/42 × 1 = 1/42 - Add the two like fractions:
16/42 + 1/42 = 16 + 1/42 = 17/42 - So, 8/21 + 1/42 = 17/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+1/42 8/21+2/42 8/42+1/42 8/21+1/84 24/21+1/42 8/21+3/42 8/63+1/42 40/21+1/42 8/21+5/42 56/21+1/42 8/21+7/42