Ancient Egyptian: Multiplication + Division

77 divided by 6

1                6 

2                12

3                18

4                24

5                30

6                36

7                42

8                48

9                54

10                60

11                66

12                72

1/2                3

1/3                2

1/6                1

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Total : 12 + 1/2 + 1/3              72 + 3 + 2 = 77

Using 5 as a divisor and using the Ancient Egyptian method of division, it will not work when dividing 77.  Trying 7 as a divisor, it will also not work.  I hypothesis that prime number divisors are limited because of its factors.