Add 8/5 and 70/21
1st number: 1 3/5, 2nd number: 3 7/21
8/5 + 70/21 is 74/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
8/5 = 8 × 21/5 × 21 = 168/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
70/21 = 70 × 5/21 × 5 = 350/105 - Add the two like fractions:
168/105 + 350/105 = 168 + 350/105 = 518/105 - 518/105 simplified gives 74/15
- So, 8/5 + 70/21 = 74/15
In mixed form: 414/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/5+70/21 8/10+70/21 8/5+70/42 24/5+70/21 8/15+70/21 8/5+70/63 40/5+70/21 8/25+70/21 56/5+70/21 8/35+70/21