Here comes a grand number: N = 11986 + 21986 + 31986 + 41986.
Can you find its last digit?
Hint Let’s start with 21986. Can we write it as product of factors whose last digits are easy to determine? What number, power of 2, yields the same last digit when raised to any power? It’s 16 = 24. 16 raised to any power will give a number that ends in 6 (because 6 raised to any power gives a number that ends is 6. Always.)