Question 7 (i)
Without adding, find the sum:

1 +3 + 5+7 + 9

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Solution

Here, there are five odd numbers. (n=5)

We know that sum of ‘n’ odd numbers $= n^{2}$

$∴ 1 + 3 + 5 + 7 + 9 = 5^{2} = 25$

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Similar questions

Question 7 (i)
Without adding, find the sum:

1 +3 + 5+7 + 9

Question 7 (ii)
Without adding, find the sum:

1 +3 + 5+7 + 9 +11 +13+ 15 + 17+19

Without adding, find the sum of $1 + 3 + 5 + 7 + 9$

Without adding find the sum

(i) 1 + 3 + 5 + 7 + 9

(ii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19

(iii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23

1 + 3 + 5 + 7 + 9

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23

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