Add 8/30 and 84/21
1st number: 8/30, 2nd number: 4 0/21
8/30 + 84/21 is 64/15.
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,
8/30 = 8 × 7/30 × 7 = 56/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
84/21 = 84 × 10/21 × 10 = 840/210 - Add the two like fractions:
56/210 + 840/210 = 56 + 840/210 = 896/210 - 896/210 simplified gives 64/15
- So, 8/30 + 84/21 = 64/15
In mixed form: 44/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/30+84/21 8/60+84/21 8/30+84/42 24/30+84/21 8/90+84/21 8/30+84/63 40/30+84/21 56/30+84/21