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 ~