Question

Find the sum of the following number sequence: `1+2+3+4+5+6+7+8+9+10`?

Answer 1

55

Explanation:

Add the first and the last numbers of the sequence and repeat for the other sets of numbers.

`1 + 10 = 11`
`2 + 9 = 11`
`3 + 8 = 11`
`4 +7 = 11`
`5 + 6 = 11`

This gives 5 sets of numbers that equal 11.

`5 xx 11 = 55`