Question 1205325
<pre>
How about this way?:

<img src="https://i.ibb.co/MPfy9Qc/12.png" height="50px">

0.5 + 1.5 + 2.5 + 3.5 + ... + 51.5 = 

The sum of the whole parts:

0 + 1 + 2 + 3 + ... + 51 = {{{(51)(52)/2}}} = 1326

PLUS

the sum of the 52 decimal parts of 0.5 each:

52 x 0.5 = 26

EQUALS

1352

Edwin</pre>