Add 75/70 and 21/28
1st number: 1 5/70, 2nd number: 21/28
75/70 + 21/28 is 51/28.
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,
75/70 = 75 × 2/70 × 2 = 150/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
21/28 = 21 × 5/28 × 5 = 105/140 - Add the two like fractions:
150/140 + 105/140 = 150 + 105/140 = 255/140 - 255/140 simplified gives 51/28
- So, 75/70 + 21/28 = 51/28
In mixed form: 123/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/70+42/28 75/70+21/56 75/70+63/28 75/70+21/84