Add 42/20 and 18/45
1st number: 2 2/20, 2nd number: 18/45
42/20 + 18/45 is 5/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
42/20 = 42 × 9/20 × 9 = 378/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
18/45 = 18 × 4/45 × 4 = 72/180 - Add the two like fractions:
378/180 + 72/180 = 378 + 72/180 = 450/180 - 450/180 simplified gives 5/2
- So, 42/20 + 18/45 = 5/2
In mixed form: 21/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/20+18/45 42/20+36/45 42/40+18/45 42/20+18/90 42/20+54/45 42/60+18/45 42/20+90/45