what is zero minus negative two

This is one way you can think of it.

If it were -40 degrees centigrade it would be very cold.  If it were +40 degrees centigrade it would be very hot

so

negative numbers are cold numbers and positive numbers are hot numbers.

0- -2 is 0degrees take away some cold.  if you take away some cold air it must get hotter! so - - = +

0- -2 = 0+2 = 2

0 - (-2)

 

0 + 2

 

2

 

Subtracting by a negative is the same as adding a regular number, the subtract sign and negative cancel each other out.