Add 4/30 and 28/21
1st number: 4/30, 2nd number: 1 7/21
4/30 + 28/21 is 22/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
4/30 = 4 × 7/30 × 7 = 28/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
28/21 = 28 × 10/21 × 10 = 280/210 - Add the two like fractions:
28/210 + 280/210 = 28 + 280/210 = 308/210 - 308/210 simplified gives 22/15
- So, 4/30 + 28/21 = 22/15
In mixed form: 17/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/30+28/21 4/30+56/21 4/60+28/21 4/30+28/42 12/30+28/21 4/30+84/21 4/90+28/21 4/30+28/63 20/30+28/21 28/30+28/21