Add 70/21 and 12/80
1st number: 3 7/21, 2nd number: 12/80
70/21 + 12/80 is 209/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
70/21 = 70 × 80/21 × 80 = 5600/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
12/80 = 12 × 21/80 × 21 = 252/1680 - Add the two like fractions:
5600/1680 + 252/1680 = 5600 + 252/1680 = 5852/1680 - 5852/1680 simplified gives 209/60
- So, 70/21 + 12/80 = 209/60
In mixed form: 329/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+24/80 70/42+12/80 70/21+36/80 70/63+12/80 70/21+60/80 70/21+84/80