Math 6

Question Analysis
This question involves the subtraction of a negative number.
The main focus is on understanding the rule for subtracting a negative number, which is equivalent to adding a positive number.

Key Concept Explanation
Subtracting a negative number is the same as changing the operation to addition and changing the sign of the number being subtracted.
So, a - (-b) = a + b.

Step-by-Step Solution
For -18 - (-13), we change the subtraction of -13 to addition of 13.
So, -18 - (-13) = -18 + 13.

Common Mistakes
Forgetting the rule tha...