Add 3/45 and 81/42
1st number: 3/45, 2nd number: 1 39/42
3/45 + 81/42 is 419/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
3/45 = 3 × 14/45 × 14 = 42/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
81/42 = 81 × 15/42 × 15 = 1215/630 - Add the two like fractions:
42/630 + 1215/630 = 42 + 1215/630 = 1257/630 - 1257/630 simplified gives 419/210
- So, 3/45 + 81/42 = 419/210
In mixed form: 1209/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/45+81/42 3/90+81/42 3/45+81/84 9/45+81/42 15/45+81/42 21/45+81/42