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1.
Suppose that 6472 had a 2 for its unit digit. That is, suppose 6472=19,381,62. What would the unit digit of 6473 be?
Hint.
6473=66472.
2.
What is the unit digit of 62, of 63, and of 64?
The unit’s digit of 62 is .
The unit’s digit of 63 is .
The unit’s digit of 64 is .
3.
Which of the following are true? Select all that apply.
  • If the unit’s digit of 6k is a 6, then the unit’s digit of 6k+1 is a 6.
  • If the unit’s digit of 6k is a 2, then the unit’s digit of 6k+1 is a 2.
  • The unit’s digit of 6472 is a 2.
  • The unit’s digit of 6472 is a 6.
4.
Explain your answer to the previous question.