Add 7/42 and 8/21
7/42 + 8/21 is 23/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
7/42 = 7 × 1/42 × 1 = 7/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
8/21 = 8 × 2/21 × 2 = 16/42 - Add the two like fractions:
7/42 + 16/42 = 7 + 16/42 = 23/42 - So, 7/42 + 8/21 = 23/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42+8/21 7/42+16/21 7/84+8/21 7/42+8/42 21/42+8/21 7/42+24/21 7/42+8/63 35/42+8/21 7/42+40/21 49/42+8/21 7/42+56/21