Add 70/84 and 21/8
1st number: 70/84, 2nd number: 2 5/8
70/84 + 21/8 is 83/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 84 × 2 = 168,
70/84 = 70 × 2/84 × 2 = 140/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
21/8 = 21 × 21/8 × 21 = 441/168 - Add the two like fractions:
140/168 + 441/168 = 140 + 441/168 = 581/168 - 581/168 simplified gives 83/24
- So, 70/84 + 21/8 = 83/24
In mixed form: 311/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/84+42/8 70/84+21/16 70/84+63/8 70/84+21/24 70/84+21/40 70/84+21/56