Finding the least common denominator

unlike fractions

100

1\18 + 5\6=

16\18

200

9\16- 5\12=

7\48

300

7\15+1\5=

4\15

400

4+8\9=

4 8\9

500

2\5+4\15+1\5=

1 2\15

Real world

100

If 2\3 of the girls in class have brown eyes and 1\4 of the girls have blue eyes, what fraction of the girls in class have neither blue or brown eyes?

-5\12

200

Jeff made a banana cream pie. His brother ate 1\3 of the pie and his sister ate 2\5 of the pie. How much lees did his brother eat than his sister?

-1\15