Add 72/70 and 28/20
1st number: 1 2/70, 2nd number: 1 8/20
72/70 + 28/20 is 17/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
72/70 = 72 × 2/70 × 2 = 144/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
28/20 = 28 × 7/20 × 7 = 196/140 - Add the two like fractions:
144/140 + 196/140 = 144 + 196/140 = 340/140 - 340/140 simplified gives 17/7
- So, 72/70 + 28/20 = 17/7
In mixed form: 23/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/70+56/20 72/70+28/40 72/70+84/20 72/70+28/60