Add 70/90 and 21/50
70/90 + 21/50 is 539/450.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 50 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 90 × 5 = 450,
70/90 = 70 × 5/90 × 5 = 350/450 - Likewise, for the 2nd fraction, since 50 × 9 = 450,
21/50 = 21 × 9/50 × 9 = 189/450 - Add the two like fractions:
350/450 + 189/450 = 350 + 189/450 = 539/450 - So, 70/90 + 21/50 = 539/450
In mixed form: 189/450
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90+42/50 70/90+63/50