Introduction:
The expression 99 - (-1) seems simple, but it can be confusing if you don't understand the concept of negative numbers and their operations. In this explanation, we will break down the expression and explain why it may be difficult to understand without proper knowledge.

Understanding the concept of negative numbers:
Before we dive into the expression, it is important to understand the concept of negative numbers. Negative numbers represent values less than zero and are denoted by a minus sign (-) placed before the number.

Breaking down the expression:
Let's break down the expression 99 - (-1) into smaller parts to understand it better:

1. Positive number:
- 99: This is a positive number greater than zero.

2. Negative number:
- (-1): This is a negative number less than zero.

Subtraction of negative numbers:
When we subtract a negative number from a positive number, it is equivalent to adding the positive number. In other words, subtracting a negative number is the same as adding its absolute value.

Simplifying the expression:
To simplify 99 - (-1), we can rewrite it as 99 + 1, since subtracting a negative number is the same as adding its absolute value.

Calculating the result:
Now, let's calculate the expression:
99 + 1 = 100

So, 99 - (-1) is equal to 100.

Why it may be confusing:
The expression 99 - (-1) may be confusing because of the double negative sign. A common misconception is that subtracting a negative number results in a positive number. However, in this case, subtracting a negative number is equivalent to adding a positive number.

Importance of understanding negative numbers:
Understanding negative numbers is crucial in various mathematical operations, including addition, subtraction, multiplication, and division. Without a solid understanding of negative numbers, it becomes difficult to perform these operations accurately.

Conclusion:
The expression 99 - (-1) can be understood by breaking it down into smaller parts and understanding the concept of negative numbers. Subtracting a negative number is equivalent to adding its absolute value. Therefore, 99 - (-1) simplifies to 99 + 1, which equals 100. It is important to grasp the concept of negative numbers to perform mathematical operations accurately.

99-(-1)=100 because - - = +( Neg ,Neg = Positive) ,so 99-(-1)=100
We will add
(And positive number is greater then the negative number ,so the answer will also positive)