SOLUTION: How to find the sum of even numbers from 2 to 80?
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Question 1070098
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How to find the sum of even numbers from 2 to 80?
Found 2 solutions by
josgarithmetic, Alan3354
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Answer by
josgarithmetic(39618)
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2 times sum from 1 to 40.
Answer by
Alan3354(69443)
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put this solution on YOUR website!
How to find the sum of even numbers from 2 to 80?
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2 to 80 --> 40 even numbers.
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Use pairs:
2 + 80 = 82
4 + 78 = 82
6 + 76 = 82
etc for 20 pairs
20*82 = 1640