Question

4 friends equally share half of a pizza how much of the whole pizza does each friend get

Answer 1

1/2 / 4

The formula = keep, change, flip

Keep 1/2
Change the sign: / to ×
Flip 4 to 1/4

That equals 1/2 × 1/4 = 1/16

Answer = 1/16

Hope this helped☺☺

Answer 2

You could solve this problem one of two ways- 
1) 
100/4 25/2 12.5 
100, equals the entire pizza. 4, is the number of people. 25, is the amount they all get. They you divide by 2 since it is only a half pizza. 
-or- 
2) 
100/2 50 50/4 12.5 
100, equals the entire pizza. Divide that by 2 since it half a pizza. 100/2 equals 50. Then, since there is 4 friends you divide 50 by 4. Which equals 12.5. 
In conclusion, the final answer is 12.5% of the pizza each. 
Hope this helps!!