What is the units digits of 3 to the power of 20 I got 3 486 784 401 I put 3 to the power of 20= 3 486 784 401 as my answer how is that .5 on a test?
3^20=9^10=81^5
Now if you multiply 2 numbers together that both and in 1 then the last digit must be 1.
That is what they wanted you to say :)
You got it right!!!. Congrats....
