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What is the sum of the first twenty counting numbers?

Updated: 8/19/2019
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Wiki User

12y ago

Best Answer

20*(20+1)/2 = 210

If you want to see how this works, or even the beauty in numbers, you can do so in MS Excel. In cell A1 put "=ROW()" B1: "=SUM(A$1:A1)" C1: "B1/A1". Then, select and copy those three cells. Paste the content in any number of rows down in those three columns.

Be sure to note the following patterns:

Every 20 numbers, the one's digit repeats itself in the sum column (B column),

The sum of the first 10 numbers is 55, the first 100 is 5050, 1000 is 500500.

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12y ago
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9y ago

The sum of first 20 counting numbers is 190.

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Q: What is the sum of the first twenty counting numbers?
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