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Addition is one of the basic operations in arithmetic and involves combining numbers to get their total sum. In our exercise, we are tasked with finding the sum of 16, 11, and 18. Addition is often represented by the plus symbol "+".
To find the sum, we start by adding two numbers, and then add the result to the next number. For example:

• Add 16 and 11 to get 27.
• Then, add 27 and 18 to reach a total of 45.

As you can see, addition helps us combine values into a single larger quantity.
When performing addition, it's helpful to line up the numbers vertically, ensuring each digit is in the correct column. This helps to avoid errors, especially with larger numbers.

Division is the process of splitting a number into equal parts or groups. It is one of the fundamental operations of arithmetic, alongside addition, subtraction, and multiplication. In our problem, we divide 45 by 3. This is referred to as a division operation where 45 is the dividend and 3 is the divisor.
To divide a number, consider how many times the divisor can be subtracted from the dividend. Here, we check how many times 3 can fit into 45, which in this case is 15 times.
Division can also be represented in different ways, such as by using a fraction bar, where the dividend is above and the divisor is below the line, as in our original exercise \(\frac{45}{3}\). This results in a quotient, which is the answer to a division problem.

In fractions, the numerator is the number located above the fraction bar. It indicates how many parts of the whole are being considered. In the initial exercise, after performing addition, the numerator is 45.
The numerator is a key element in fractions because it represents the value to be divided by the number below the fraction bar, known as the denominator. A larger numerator compared to the denominator represents a number greater than one, while a smaller numerator indicates a portion of the whole number.
When interpreting or solving a fraction, always look at the numerator first. It tells you the number of parts you have, which helps in understanding and solving calculations involving fractions.