Add 70/90 and 21/54
70/90 + 21/54 is 7/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 90 × 3 = 270,
70/90 = 70 × 3/90 × 3 = 210/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
21/54 = 21 × 5/54 × 5 = 105/270 - Add the two like fractions:
210/270 + 105/270 = 210 + 105/270 = 315/270 - 315/270 simplified gives 7/6
- So, 70/90 + 21/54 = 7/6
In mixed form: 11/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90+42/54 70/90+63/54