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If you want to sum up numbers 1 to N, you can do it this way. Sum = (N+1)*(N/2).
The reason this works: say you want to sum up 1 through 10. You have 10+1, 9+2, ..., 6+5. Each of these equals 11 [N+1]. You added 11 five times (N/2). Sum of 1 to 102 = (102+1)*(102/2) = 103*51 = 5253. You can check it by summing up the numbers with a spreadsheet.
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Earn +20 ptsQ: What is the sum of the first 102 counting numbers?
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Continue Learning about Other Math
What is the sum of the first 50 counting numbers?
The sum of the first 50 counting numbers, excluding zero, is 1,251.
What is the sum of the first 500 odd counting numbers?
The sum of the first 500 odd counting numbers is 250,000.
What is the sum of first 10 counting numbers?
The sum of the first 10 counting numbers (1-10) is 51.
How much greater is the sum of the first 20 counting numbers than the sum of the first 10 counting numbers?
It is 155 greater.
What is the sum of the first 500 couting numbers?
The sum of the first 500 counting numbers (1-500) is 125,001.
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