Try this ACT math practice question that tests your ability to recognize a pattern in units digits of large powers of an integer.

The units digit(the digit in the one’s place of a number) of $7^{77}$ is $7$. What is the units digit of $7^{80}$?

- $\quad 0$
- $\quad 1$
- $\quad 3$
- $\quad 7$
- $\quad 9$

**Video explanation**