Add 72/20 and 28/70
1st number: 3 12/20, 2nd number: 28/70
72/20 + 28/70 is 4/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
72/20 = 72 × 7/20 × 7 = 504/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
28/70 = 28 × 2/70 × 2 = 56/140 - Add the two like fractions:
504/140 + 56/140 = 504 + 56/140 = 560/140 - 560/140 simplified gives 4/1
- So, 72/20 + 28/70 = 4/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20+56/70 72/40+28/70 72/20+84/70 72/60+28/70