Add 81/42 and 5/45
1st number: 1 39/42, 2nd number: 5/45
81/42 + 5/45 is 257/126.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
81/42 = 81 × 15/42 × 15 = 1215/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
5/45 = 5 × 14/45 × 14 = 70/630 - Add the two like fractions:
1215/630 + 70/630 = 1215 + 70/630 = 1285/630 - 1285/630 simplified gives 257/126
- So, 81/42 + 5/45 = 257/126
In mixed form: 25/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/42+10/45 81/84+5/45 81/42+5/90 81/42+15/45 81/42+25/45 81/42+35/45