Add 1/21 and 80/45
1st number: 1/21, 2nd number: 1 35/45
1/21 + 80/45 is 115/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
1/21 = 1 × 15/21 × 15 = 15/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
80/45 = 80 × 7/45 × 7 = 560/315 - Add the two like fractions:
15/315 + 560/315 = 15 + 560/315 = 575/315 - 575/315 simplified gives 115/63
- So, 1/21 + 80/45 = 115/63
In mixed form: 152/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+80/45 1/42+80/45 1/21+80/90 3/21+80/45 1/63+80/45 5/21+80/45 7/21+80/45