Add 21/27 and 70/20
1st number: 21/27, 2nd number: 3 10/20
21/27 + 70/20 is 77/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 20 is 540
Next, find the equivalent fraction of both fractional numbers with denominator 540 - For the 1st fraction, since 27 × 20 = 540,
21/27 = 21 × 20/27 × 20 = 420/540 - Likewise, for the 2nd fraction, since 20 × 27 = 540,
70/20 = 70 × 27/20 × 27 = 1890/540 - Add the two like fractions:
420/540 + 1890/540 = 420 + 1890/540 = 2310/540 - 2310/540 simplified gives 77/18
- So, 21/27 + 70/20 = 77/18
In mixed form: 45/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/27+70/20 21/54+70/20 21/27+70/40 63/27+70/20 21/81+70/20 21/27+70/60