First of all, remember the law of pros and cons:
Addition and subtraction: subtracting a negative number is the same as adding a positive number, for example:1-(-1) =1+1.
Adding negative is the same as subtracting positive:1+(-1) =1-1.
Others can be added and subtracted as usual ~
Multiplication and division: negative numbers are positive numbers. Such as: (-2)*(-2)=4,
(-2)/(-2)= 1
The minus sign is negative: (-2)/2=- 1.
(-2)*2=-4
The others are the same as the general multiplication and division method.
Pay attention to the problem of parentheses when writing, and negative numbers must be enclosed in parentheses ~
Come to me if you don't understand anything, and I'll try my best ~