Add 4/45 and 18/20
4/45 + 18/20 is 89/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
4/45 = 4 × 4/45 × 4 = 16/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
18/20 = 18 × 9/20 × 9 = 162/180 - Add the two like fractions:
16/180 + 162/180 = 16 + 162/180 = 178/180 - 178/180 simplified gives 89/90
- So, 4/45 + 18/20 = 89/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/45+18/20 4/45+36/20 4/90+18/20 4/45+18/40 12/45+18/20 4/45+54/20 4/45+18/60 20/45+18/20 4/45+90/20 28/45+18/20