Add 18/80 and 45/30
1st number: 18/80, 2nd number: 1 15/30
18/80 + 45/30 is 69/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 30 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 80 × 3 = 240,
18/80 = 18 × 3/80 × 3 = 54/240 - Likewise, for the 2nd fraction, since 30 × 8 = 240,
45/30 = 45 × 8/30 × 8 = 360/240 - Add the two like fractions:
54/240 + 360/240 = 54 + 360/240 = 414/240 - 414/240 simplified gives 69/40
- So, 18/80 + 45/30 = 69/40
In mixed form: 129/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/80+45/30 18/80+90/30 18/80+45/60 54/80+45/30 18/80+45/90 90/80+45/30