Add 72/70 and 45/28
1st number: 1 2/70, 2nd number: 1 17/28
72/70 + 45/28 is 369/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 28 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 28 × 5 = 140,
45/28 = 45 × 5/28 × 5 = 225/140 - Add the two like fractions:
144/140 + 225/140 = 144 + 225/140 = 369/140 - So, 72/70 + 45/28 = 369/140
In mixed form: 289/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/70+90/28 72/70+45/56 72/70+45/84