Add 42/9 and 5/21
1st number: 4 6/9, 2nd number: 5/21
42/9 + 5/21 is 103/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
42/9 = 42 × 7/9 × 7 = 294/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
5/21 = 5 × 3/21 × 3 = 15/63 - Add the two like fractions:
294/63 + 15/63 = 294 + 15/63 = 309/63 - 309/63 simplified gives 103/21
- So, 42/9 + 5/21 = 103/21
In mixed form: 419/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/9+5/21 42/9+10/21 42/18+5/21 42/9+5/42 42/9+15/21 42/27+5/21 42/9+5/63 42/9+25/21 42/45+5/21 42/9+35/21 42/63+5/21