Add 84/10 and 12/21
1st number: 8 4/10, 2nd number: 12/21
84/10 + 12/21 is 314/35.
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,
84/10 = 84 × 21/10 × 21 = 1764/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
12/21 = 12 × 10/21 × 10 = 120/210 - Add the two like fractions:
1764/210 + 120/210 = 1764 + 120/210 = 1884/210 - 1884/210 simplified gives 314/35
- So, 84/10 + 12/21 = 314/35
In mixed form: 834/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/10+24/21 84/20+12/21 84/10+12/42 84/10+36/21 84/30+12/21 84/10+12/63 84/10+60/21 84/50+12/21 84/10+84/21 84/70+12/21