Add 45/60 and 42/81
45/60 + 42/81 is 137/108.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 60 × 27 = 1620,
45/60 = 45 × 27/60 × 27 = 1215/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
42/81 = 42 × 20/81 × 20 = 840/1620 - Add the two like fractions:
1215/1620 + 840/1620 = 1215 + 840/1620 = 2055/1620 - 2055/1620 simplified gives 137/108
- So, 45/60 + 42/81 = 137/108
In mixed form: 129/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/60+42/81 45/60+84/81