Add 45/18 and 75/20
1st number: 2 9/18, 2nd number: 3 15/20
45/18 + 75/20 is 25/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 18 × 10 = 180,
45/18 = 45 × 10/18 × 10 = 450/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
75/20 = 75 × 9/20 × 9 = 675/180 - Add the two like fractions:
450/180 + 675/180 = 450 + 675/180 = 1125/180 - 1125/180 simplified gives 25/4
- So, 45/18 + 75/20 = 25/4
In mixed form: 61/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/18+75/20 45/36+75/20 45/18+75/40 45/54+75/20 45/18+75/60 45/90+75/20