Add 70/20 and 84/7
1st number: 3 10/20, 2nd number: 12 0/7
70/20 + 84/7 is 31/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
70/20 = 70 × 7/20 × 7 = 490/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
84/7 = 84 × 20/7 × 20 = 1680/140 - Add the two like fractions:
490/140 + 1680/140 = 490 + 1680/140 = 2170/140 - 2170/140 simplified gives 31/2
- So, 70/20 + 84/7 = 31/2
In mixed form: 151/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/40+84/7 70/20+84/14 70/60+84/7 70/20+84/21 70/20+84/35 70/20+84/49