Add 15/24 and 90/21
1st number: 15/24, 2nd number: 4 6/21
15/24 + 90/21 is 275/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
15/24 = 15 × 7/24 × 7 = 105/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
90/21 = 90 × 8/21 × 8 = 720/168 - Add the two like fractions:
105/168 + 720/168 = 105 + 720/168 = 825/168 - 825/168 simplified gives 275/56
- So, 15/24 + 90/21 = 275/56
In mixed form: 451/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/24+90/21 15/48+90/21 15/24+90/42 45/24+90/21 15/72+90/21 15/24+90/63 75/24+90/21