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Addition and subtraction are fundamental operations in basic arithmetic. They help us combine or separate numbers. When dealing with subtraction, as in this exercise, you start by identifying the numbers involved. Subtraction involves finding the difference between two numbers. In our case, we start with 518 and need to subtract 118. You can arrange these numbers vertically to ensure proper subtraction or do it in your head if you're comfortable. The rule is simple: subtract each digit from the one in the same place value column, starting from the right. If a digit being subtracted is larger than the digit above it, you'll need to "borrow" from the next column to the left. This exercise, however, is straightforward:

• Start with 518.
• Subtract 118.
• The result is 400.

Understanding how to subtract is crucial in mastering more complex mathematical concepts.

Whole numbers include all positive integers starting from zero, such as 0, 1, 2, 3, and so on. They are numbers without fractions or decimals, making them integral to basic arithmetic. In our exercise, both 518 and 118 are whole numbers. When we subtract these numbers, 400, also a whole number, is the result.
Whole numbers are everywhere, and they form the foundation for all other branches of mathematics. They help represent counts of objects, ages, prices, or any scenario where fractions and decimals aren't necessary. In arithmetic operations like subtraction, we're usually working with whole numbers. When subtracting one whole number from another, as we did here, the result generally remains a whole number, simplifying further calculations.

Number reduction involves simplifying a number to its most basic form. In the context of subtraction, it means checking whether the result of a subtraction can be further simplified or reduced. A number is reduced to its lowest terms when it can no longer be divided by any number except one and itself without leaving a remainder.
In our exercise, after subtracting 118 from 518, we were left with 400. Since 400 is a whole number with no fractional component, there's no need to reduce it further. The term "reduce to the lowest terms" usually applies to fractions, but with whole numbers, like 400, this step is simply about confirming that no further simplification is needed.

• Reduction ensures numbers are as simple as possible.
• For whole numbers like 400, this means ensuring it's not divisible into smaller integer parts without remainders.

Understanding when and how to reduce numbers helps in solving arithmetic problems efficiently and prevents unnecessary complications in calculations.