Sum of the first 5 square numbers

We define square numbers as numbers that when squared will equal a whole number. Thus, the list of the first square numbers starts with 1, 4, 9, 16, and so on.

What is the sum of the first 5 square numbers, you ask? Here we will give you the formula to calculate the first 5 square numbers and then we will show you how to calculate the first 5 square numbers using the formula.

The formula to calculate the first n square numbers is displayed below:

		n(n + 1) × (2(n) + 1)
		6

To calculate the sum of the first 5 square numbers, we enter n = 5 into our formula to get this:

		5(5 + 1) × (2(5) + 1)
		6

First, calculate each section of the numerator: 5(5 + 1) equals 30 and (2(5) + 1) equals 11. Therefore, the problem above becomes this:

		30 × 11
		6

Next, we calculate 30 times 11 which equals 330. Now our problem looks like this:

		330
		6

Finally, divide the numerator by the denominator to get our answer:

330 ÷ 6 = 55

There you go. The sum of the first 5 square numbers is 55.

You may also be interested to know that if you list the first 5 square numbers 1, 2, 9, etc., the 5th square number is 25.

Sum of Square Numbers Calculator
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