# SUM the numbers if you can.

Enter The total from 1 to the number given: example sum 1 to 5 = 15
Add up from 1 to the number given inclusive:
E.g. Sum of all numbers from 1 to 5 = 15 (1 + 2 + 3 + 4 + 5)
A mental arithmatic test for jetpunkers.
For those that read the instructions: n x 1/2n + 1/2n = the total sum from 1.
Quiz by Malbaby
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Last updated: December 5, 2017
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 First submitted December 5, 2017 Times taken 70 Average score 65.0% Report this quiz Report
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 Hint Answer 8 36 44 990 16 136 100 5050 38 741 6 21 21 231 88 3916 25 325 11 66 32 528 7 28 50 1275 14 105 9 45 40 820 22 253 18 171 70 2485 24 300
+1
Level 22
Jul 14, 2018
Dominated this quiz with 1/20! lol
+1
Level 70
Jul 14, 2018
Plenty of room for improvement then!
+1
Level 74
Jul 18, 2018
This is an amazing quiz and a real challenge
+1
Level 74
Jul 18, 2018
Another trick is n*(n+1)/2 also gives you the sum of all the numbers from 1. e.g. for 8 do 8*9/2
+1
Level 60
Sep 4, 2022
that's what I did too
+1
Level 51
Oct 16, 2022
([X/2]+0.5)*X

E.G. ([8/2]+0.5)*8