Without adding, find the sum of the following numbers
1 + 3 + 5 + 7 + 9 =
Given, 5 consecutive odd numbers sum. To find out, the sum of consecutive odd numbers from “1” to “9” without adding.
We have sum of first n odd numbers = n2.
Here, n = 5
⇒ 1 + 3 + 5 + 7 + 9 = 52
⇒ 1 + 3 + 5 + 7 + 9 = 25
Hence, the sum of 1 + 3 + 5 + 7 + 9 without adding = 25
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