Add 21/80 and 30/27
1st number: 21/80, 2nd number: 1 3/27
21/80 + 30/27 is 989/720.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 27 is 2160
Next, find the equivalent fraction of both fractional numbers with denominator 2160 - For the 1st fraction, since 80 × 27 = 2160,
21/80 = 21 × 27/80 × 27 = 567/2160 - Likewise, for the 2nd fraction, since 27 × 80 = 2160,
30/27 = 30 × 80/27 × 80 = 2400/2160 - Add the two like fractions:
567/2160 + 2400/2160 = 567 + 2400/2160 = 2967/2160 - 2967/2160 simplified gives 989/720
- So, 21/80 + 30/27 = 989/720
In mixed form: 1269/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+30/27 21/80+60/27 21/80+30/54 63/80+30/27 21/80+90/27 21/80+30/81