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Unit Digit


1. Find the unit digit of 7^10 + 8^12 + 9^13.

2

4

6

8


2. What is the last digit of the number 3^20?

1

3

7

9


3. Find the unit digit of 5^10 + 6^12 + 7^13.

2

4

6

8


4. What is the unit digit of 6^15?

4

6

2

8


5. Which of the following numbers is divisible by 9?

108

237

405

551


6. Find the unit digit of the square of (49)^2.

1

4

6

9


7. What is the last digit of the number 2^17?

1

2

3

4


8. What is the last digit of the number 2^10 + 3^10 + 4^10 + 5^10?

3

4

5

9


9. What is the last digit of the number 7^11?

1

3

7

9


10. What is the unit digit of the product 7 * 8 * 9 * 6 * 5 * 4 * 3 * 2 * 1?

0

1

5

9