Add 84/21 and 30/8
1st number: 4 0/21, 2nd number: 3 6/8
84/21 + 30/8 is 31/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
84/21 = 84 × 8/21 × 8 = 672/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
30/8 = 30 × 21/8 × 21 = 630/168 - Add the two like fractions:
672/168 + 630/168 = 672 + 630/168 = 1302/168 - 1302/168 simplified gives 31/4
- So, 84/21 + 30/8 = 31/4
In mixed form: 73/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+60/8 84/42+30/8 84/21+30/16 84/21+90/8 84/63+30/8 84/21+30/24 84/21+30/40 84/21+30/56