Add 42/80 and 70/45
1st number: 42/80, 2nd number: 1 25/45
42/80 + 70/45 is 749/360.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 45 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 45 × 16 = 720,
70/45 = 70 × 16/45 × 16 = 1120/720 - Add the two like fractions:
378/720 + 1120/720 = 378 + 1120/720 = 1498/720 - 1498/720 simplified gives 749/360
- So, 42/80 + 70/45 = 749/360
In mixed form: 229/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80+70/45 42/80+70/90