Add 21/3 and 70/80
1st number: 7 0/3, 2nd number: 70/80
21/3 + 70/80 is 63/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 3 × 80 = 240,
21/3 = 21 × 80/3 × 80 = 1680/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
70/80 = 70 × 3/80 × 3 = 210/240 - Add the two like fractions:
1680/240 + 210/240 = 1680 + 210/240 = 1890/240 - 1890/240 simplified gives 63/8
- So, 21/3 + 70/80 = 63/8
In mixed form: 77/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3+70/80 21/6+70/80 63/3+70/80 21/9+70/80 21/15+70/80