843219 to the power of 100 is multiplied out, what is its units digit?

1

Step-by-step explanation:

We will consider only the last digit multiplication and the pattern.

When we multiply 843,219 with 843,219, we have

9 * 9 = 81 [1 is important]

1 * 9 = 9

9 * 9 = 81 [1 is important]

So when we multiply them out with each other, we have a pattern of

9, 1, 9, 1 ... goes on

So if we multiply 100 times, what will be the last digit of the series 9, 1, 9, 1 ... it will be 1

hence, last digit is 1