What is the sum of 84 and 21?

The answer you get when you add 84 and 21 together is called the sum. The sum of 84 and 21 is displayed below:

105

In math terms, the sum of 84 and 21 would be written as follows:

84 + 21 = 105

When you need to find the sum of numbers such as 84 and 21, just remember that you need to add the numbers together to get the sum.

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