Add 70/75 and 9/90
70/75 + 9/90 is 31/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 90 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 75 × 6 = 450,
70/75 = 70 × 6/75 × 6 = 420/450 - Likewise, for the 2nd fraction, since 90 × 5 = 450,
9/90 = 9 × 5/90 × 5 = 45/450 - Add the two like fractions:
420/450 + 45/450 = 420 + 45/450 = 465/450 - 465/450 simplified gives 31/30
- So, 70/75 + 9/90 = 31/30
In mixed form: 11/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/75+18/90 70/75+27/90 70/75+45/90 70/75+63/90