Add 21/15 and 70/54
1st number: 1 6/15, 2nd number: 1 16/54
21/15 + 70/54 is 364/135.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 15 × 18 = 270,
21/15 = 21 × 18/15 × 18 = 378/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
70/54 = 70 × 5/54 × 5 = 350/270 - Add the two like fractions:
378/270 + 350/270 = 378 + 350/270 = 728/270 - 728/270 simplified gives 364/135
- So, 21/15 + 70/54 = 364/135
In mixed form: 294/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+70/54 21/30+70/54 63/15+70/54 21/45+70/54 21/75+70/54