Add 42/4 and 28/21
1st number: 10 2/4, 2nd number: 1 7/21
42/4 + 28/21 is 71/6.
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,
28/21 = 28 × 4/21 × 4 = 112/84 - Add the two like fractions:
882/84 + 112/84 = 882 + 112/84 = 994/84 - 994/84 simplified gives 71/6
- So, 42/4 + 28/21 = 71/6
In mixed form: 115/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/4+28/21 42/4+56/21 42/8+28/21 42/4+28/42 42/4+84/21 42/12+28/21 42/4+28/63 42/20+28/21 42/28+28/21