Find the unit digit of `123 + 345 + 780 + 65 + 44`.

Explanation

We can find the unit digit just by adding the unit digits 3,5,0,5,4 as
3+5+0+5+4=17
So the unit digit (or the lest digit) of the resultant value of the expression 123+ 345+ 780+65+ 44 will be 7. (you can verify it by doing the whole sum)