Something Very New…

Here’s a math problem:
the numbers from 1 to 100 added (1+2+3…+100)

The catch: do it in 10 or less seconds.
If it feels impossible, it’s not. The technique…
Put the numbers 1-50 in a line and write the numbers 51-100 backward underneath

1         2     3      4      5       6       7      8     9      10 …
+      +     +     +      +       +      +       +     +      +
100   99   98  97    96    95    94    93   92   91 …
— — — — — — — — — —
101   101   101  101    101   101  101   101  101  101

As you can see, the added numbers all equal 101. Since there are 50 pairs, 101×50= 5,050. That is the answer to the question.

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