Add 70/21 and 15/80
1st number: 3 7/21, 2nd number: 15/80
70/21 + 15/80 is 169/48.
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,
15/80 = 15 × 21/80 × 21 = 315/1680 - Add the two like fractions:
5600/1680 + 315/1680 = 5600 + 315/1680 = 5915/1680 - 5915/1680 simplified gives 169/48
- So, 70/21 + 15/80 = 169/48
In mixed form: 325/48
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+30/80 70/42+15/80 70/21+45/80 70/63+15/80 70/21+75/80