Add 70/75 and 42/45
70/75 + 42/45 is 28/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 45 is 225
Next, find the equivalent fraction of both fractional numbers with denominator 225 - For the 1st fraction, since 75 × 3 = 225,
70/75 = 70 × 3/75 × 3 = 210/225 - Likewise, for the 2nd fraction, since 45 × 5 = 225,
42/45 = 42 × 5/45 × 5 = 210/225 - Add the two like fractions:
210/225 + 210/225 = 210 + 210/225 = 420/225 - 420/225 simplified gives 28/15
- So, 70/75 + 42/45 = 28/15
In mixed form: 113/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/75+84/45 70/75+42/90