Add 42/4 and 7/21
1st number: 10 2/4, 2nd number: 7/21
42/4 + 7/21 is 65/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
42/4 = 42 × 21/4 × 21 = 882/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
7/21 = 7 × 4/21 × 4 = 28/84 - Add the two like fractions:
882/84 + 28/84 = 882 + 28/84 = 910/84 - 910/84 simplified gives 65/6
- So, 42/4 + 7/21 = 65/6
In mixed form: 105/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/4+7/21 42/4+14/21 42/8+7/21 42/4+7/42 42/12+7/21 42/4+7/63 42/4+35/21 42/20+7/21 42/4+49/21 42/28+7/21