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Negative numbers are numbers less than zero. They are usually shown with a minus sign (-) in front of them, like -1, -2, and -5.37. Understanding negative numbers is very important in mathematics, especially when dealing with subtraction and addition.

Here's something to remember about negative numbers:
- They represent values below zero. Think of them as debts or temperatures below freezing.
- When you subtract a negative number, it's like adding a positive number. For example, to subtract -3, you add +3 instead.
- Pay close attention to the signs in front of numbers to avoid mistakes.

Adding numbers means bringing two or more numbers together to make a new total. When you add positive numbers, it's straightforward because you just combine their values. But adding negative numbers or mixing positive and negative numbers needs careful attention.

Here's how you handle different cases:
- Adding a positive number to a positive number increases the total. For example, 2 + 3 = 5.
- Adding a negative number to a positive number decreases the total. For instance, 5 + (-3) = 2.
- Adding negative numbers is like subtracting their absolute values. For example, (-2) + (-3) = -5.

In the case of our exercise, converting the subtraction of a negative number to an addition problem made it easier. We turned 0 - (-5.37) into 0 + 5.37.

Basic arithmetic includes addition, subtraction, multiplication, and division. These operations are the foundation of all math concepts.

Here's a quick review of each operation:
- Addition: Combining numbers to find their total.
- Subtraction: Finding the difference between numbers. When subtracting negative numbers, you add their positive equivalent.
- Multiplication: Finding the total of one number repeated a certain number of times. For example, 3 multiplied by 4 is 12.
- Division: Splitting a number into equal parts. For example, 12 divided by 3 is 4.

In our exercise, we used basic rules: converting a subtraction problem into an addition problem made it simpler to solve. Understand these operations well, and you can solve more complex math problems easily!