Add 70/45 and 81/80
1st number: 1 25/45, 2nd number: 1 1/80
70/45 + 81/80 is 1849/720.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 45 × 16 = 720,
70/45 = 70 × 16/45 × 16 = 1120/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
81/80 = 81 × 9/80 × 9 = 729/720 - Add the two like fractions:
1120/720 + 729/720 = 1120 + 729/720 = 1849/720 - So, 70/45 + 81/80 = 1849/720
In mixed form: 2409/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90+81/80