Add 70/21 and 80/35
1st number: 3 7/21, 2nd number: 2 10/35
70/21 + 80/35 is 118/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 35 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
70/21 = 70 × 5/21 × 5 = 350/105 - Likewise, for the 2nd fraction, since 35 × 3 = 105,
80/35 = 80 × 3/35 × 3 = 240/105 - Add the two like fractions:
350/105 + 240/105 = 350 + 240/105 = 590/105 - 590/105 simplified gives 118/21
- So, 70/21 + 80/35 = 118/21
In mixed form: 513/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42+80/35 70/21+80/70 70/63+80/35