Exponents and Powers Worksheet-5

Exponents and Powers Worksheet-5

1. Write 0.00043 in scientific notation.

(a) 4.3 × 10^–5    (b) 4.3 × 10^–3    (c) 4.3 × 10^–4    (d) 43 × 10^–4

2. Which shows hundred-thousandth in correct scientific notation?

(a) 1 × 10⁵          (b) 1 × 10^–6        (c) 1 × 10^–4        (d) 1 × 10^–5

3. Average thickness of a human hair is 0.00015 m. Write this in scientific notation.

(a) 1.5 × 10^–4     (b) 1.5 × 10^–3    (c) 15 × 10^–4      (d) 1.5 × 10^–6

4. How do you write 3.5 × 10^–3 in decimal notation?

(a) 0.00035      (b) 0.0035         (c) 3,500            (d) 0.035

5. Which is the symbol for square root?

(a) ||                   (b)                 (c)                 (d)

6. What is the square root of 25?

(a) 2                    (b) 10                  (c) 100                (d) 5

7. What number do you have to square to get 81?

(a) 3                    (b) 9                    (c) 7                    (d) 8

8. Which is the correct way of showing the square root of a number, y?

(a)           (b)                 (c)              (d) |2|

9. Find the value of .

(a) 8                    (b) 4                    (c) 2                    (d) 16

10. The area of a square shaped room is 144 ft². Find the width of the room.

(a) 10 ft              (b) 14 ft              (c) 15 ft               (d) 12 ft

11. Estimate the square root of 24.

(a) 4.9                (b) 3.9                (c) 6.4                 (d) 5.5

12. Find the value of:

(a) 12                   (b) 11.5               (c) 11                   (d) 14

13. Which one of these is a square root of 36?

(a) 8                    (b) 6                    (c) 9                    (d) 12

(a)                 (b)                 (c)                    (d)

15. Simplify .

(a)               (b)                 (c)               (d)

16. Which of these is same as ?

(a)               (b)             (c)               (d)

Answer Key:

(1)-(c); (2)-(d); (3)-(a); (4)-(b); (5)-(c); (6)-(d); (7)-(b); (8)-(b); (9)-(a); (10)-(d); (11)-(a); (12)-(c); (13)-(b); (14)-(d); (15)-(c); (16)-(d)