What is the sum of the first 50 natural numbers? how to solve it without adding 50 digits?

Look at the first one and the last one:                  1 + 50 = 51
Look at the second one and the second-last one:  2 + 49 = 51
Look at the third one and the third-last one:           3 + 48 = 51

Every pair you construct in this way adds up to 51 .

There are ( 50/2 ) = 25 pairs.

They all add up to ( 25 pairs ) x ( 51 per pair ) = 1,275

A

Step-by-step explanation:

The interior angles of a triangle must add to 180 degrees, so add each set of angles and see which one equals 180.

A. 22,61, 97

22+61+97=180

B. 45, 45, 60

45+45+60=150

C. 39,42,37

39+42+37=118

D. 60,110, 30

60+110+30=200

Since the set of angles for A equaled 180, it is the correct choice