You could try counting in base 561/3 = 3.825862 (approx).
It equals 24.
96
It doesn't ! -7 plus -5 equals -12 ! -7 plus 5 equals -2
If I am correct, 9 plus 7 equals 112.
89
500,500
1000 + 7 = 1007
35
1000
28
144
15,000 to the third power that equals pi plus 12 would make it the square root of 7