Types of Numbers Exercise

1. True or false?

a. 4 > 5
b. 3 + 5 = 5 + 3
c. 5 < 4
d. 5 is a factor of 120
e. 17 is a prime number
f. 4 x 3 x 5 are the prime factors of 60.

2. List the first four multiples of:

(a) 5 (b) 15 (c) 3 (d) 20

3. List the factors of: (a) 24 (b) 18 (c) 36 (d) 22

4. a. What is the highest common factor (HCF) of 20 and 30
b. What is the lowest common multiple (LCM) of 20 and 30 

5.Write these numbers as a product of their prime factors. (a)8 (b)12 (c) 24

6. Calculate:

(a)Y8_Types_of_Numbers_Ex_01.gif

(d) 6 2

(b)Y8_Types_of_Numbers_Ex_02.gif

(e) (2.3) 2

(c)Y8_Types_of_Numbers_Ex_03.gif

(f) (0.4) 2


7. Find the reciprocals of:

 

 

(a) 2

(d)Y8_Types_of_Numbers_Ex_04.gif

(b) 0.2

(e)Y8_Types_of_Numbers_Ex_05.gif

(c) 15

(f) 200

. Evaluate (write as a decimal)

8. (a) Y8_Types_of_Numbers_Ex_06.gif(b) Y8_Types_of_Numbers_Ex_07.gif(c)Y8_Types_of_Numbers_Ex_08.gif

9. Write the following numbers in standard form:

 

(a) 83.2

(d) 0.00963

(b) 0.32

(e) 8.5

(c) 541.7

(f) 321 × 10 2

10. Write the following numbers as ordinary decimals:

(a) 5.12 × 10 2 (b) 3.61 × 10 - 3 (c) 8 × 10 4