Express 169 as the sum of 13 consecutive odd natural numbers.

Sum of first odd numbers

= 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23 + 25

= (1 + 25) + (3 + 23) + (5 + 21) + (7 + 19) + (9 + 17) + (11 + 15) +13

= 26 + 26 + 26 + 26 + 26 + 26 + 13

=  (6 x 26) + 13 

= 156 + 13 

= 169

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