Add 4/10 and 15/21
4/10 + 15/21 is 39/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
4/10 = 4 × 21/10 × 21 = 84/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
15/21 = 15 × 10/21 × 10 = 150/210 - Add the two like fractions:
84/210 + 150/210 = 84 + 150/210 = 234/210 - 234/210 simplified gives 39/35
- So, 4/10 + 15/21 = 39/35
In mixed form: 14/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/10+15/21 4/10+30/21 4/20+15/21 4/10+15/42 12/10+15/21 4/10+45/21 4/30+15/21 4/10+15/63 20/10+15/21 4/10+75/21 4/50+15/21 28/10+15/21 4/70+15/21