Add 21/28 and 80/70
1st number: 21/28, 2nd number: 1 10/70
21/28 + 80/70 is 53/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
21/28 = 21 × 5/28 × 5 = 105/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
80/70 = 80 × 2/70 × 2 = 160/140 - Add the two like fractions:
105/140 + 160/140 = 105 + 160/140 = 265/140 - 265/140 simplified gives 53/28
- So, 21/28 + 80/70 = 53/28
In mixed form: 125/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+80/70 21/56+80/70 63/28+80/70 21/84+80/70