Add 45/36 and 15/21
1st number: 1 9/36, 2nd number: 15/21
45/36 + 15/21 is 55/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
45/36 = 45 × 7/36 × 7 = 315/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
15/21 = 15 × 12/21 × 12 = 180/252 - Add the two like fractions:
315/252 + 180/252 = 315 + 180/252 = 495/252 - 495/252 simplified gives 55/28
- So, 45/36 + 15/21 = 55/28
In mixed form: 127/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/36+15/21 45/36+30/21 45/72+15/21 45/36+15/42 45/36+45/21 45/36+15/63 45/36+75/21