Add 70/40 and 21/54
1st number: 1 30/40, 2nd number: 21/54
70/40 + 21/54 is 77/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 54 is 1080
Next, find the equivalent fraction of both fractional numbers with denominator 1080 - For the 1st fraction, since 40 × 27 = 1080,
70/40 = 70 × 27/40 × 27 = 1890/1080 - Likewise, for the 2nd fraction, since 54 × 20 = 1080,
21/54 = 21 × 20/54 × 20 = 420/1080 - Add the two like fractions:
1890/1080 + 420/1080 = 1890 + 420/1080 = 2310/1080 - 2310/1080 simplified gives 77/36
- So, 70/40 + 21/54 = 77/36
In mixed form: 25/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/40+42/54 70/80+21/54 70/40+63/54