Add 4/10 and 5/21
4/10 + 5/21 is 67/105.
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,
5/21 = 5 × 10/21 × 10 = 50/210 - Add the two like fractions:
84/210 + 50/210 = 84 + 50/210 = 134/210 - 134/210 simplified gives 67/105
- So, 4/10 + 5/21 = 67/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/10+5/21 4/10+10/21 4/20+5/21 4/10+5/42 12/10+5/21 4/10+15/21 4/30+5/21 4/10+5/63 20/10+5/21 4/10+25/21 4/50+5/21 28/10+5/21 4/10+35/21 4/70+5/21