Add 42/80 and 25/18
1st number: 42/80, 2nd number: 1 7/18
42/80 + 25/18 is 689/360.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 18 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
42/80 = 42 × 9/80 × 9 = 378/720 - Likewise, for the 2nd fraction, since 18 × 40 = 720,
25/18 = 25 × 40/18 × 40 = 1000/720 - Add the two like fractions:
378/720 + 1000/720 = 378 + 1000/720 = 1378/720 - 1378/720 simplified gives 689/360
- So, 42/80 + 25/18 = 689/360
In mixed form: 1329/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80+25/18 42/80+50/18 42/80+25/36 42/80+75/18 42/80+25/54 42/80+25/90