Unit Digit

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

1

4

6

9

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

0

1

5

9

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

1

3

7

9

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

4

6

2

8

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

2

4

6

8

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

1

4

6

9

7.		What is the last digit of the number 9^18?

1

3

7

9

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

2

4

6

8

9.		What is the unit digit of the number 5^17?

5

2

8

7

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

108

237

405

551