Add 42/45 and 81/20
1st number: 42/45, 2nd number: 4 1/20
42/45 + 81/20 is 299/60.
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,
42/45 = 42 × 4/45 × 4 = 168/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
81/20 = 81 × 9/20 × 9 = 729/180 - Add the two like fractions:
168/180 + 729/180 = 168 + 729/180 = 897/180 - 897/180 simplified gives 299/60
- So, 42/45 + 81/20 = 299/60
In mixed form: 459/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45+81/20 42/90+81/20 42/45+81/40 42/45+81/60