The average of the first 100 natural numbers Here we will define and show you the formula and the math to calculate the average of the first 100 natural numbers.

The first 100 natural numbers are the whole numbers (integers) that start with 1 and end with 100. To make a list of the first 100 natural numbers, you simply count up to 100.

To get the average of those 100 numbers, you add them up and then divide the sum by 100. We created a formula that can calculate the average of any sequence of natural numbers starting with 1. Here is the formula to calculate the average (avg) of the first n natural numbers:

avg = ((n × (n + 1)) ÷ 2) ÷ n

When we enter n = 100 in our formula, we get the average of the first 100 natural numbers. Here is the math and the answer:

avg = ((n × (n + 1)) ÷ 2) ÷ n
avg = ((100 × (100 + 1)) ÷ 2) ÷ 100
avg = ((100 × 101) ÷ 2) ÷ 100
avg = (10100 ÷ 2) ÷ 100
avg = 5050 ÷ 100
average = 50.5

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