## Selasa, 22 Februari 2011

### TOPIC 2 : REVISION

TOPIC 2: NUMBER PATTERNS AND SEQUENCES

OBJECTIVE
1
12, 18, 24, 30, 36, ...
Describe the pattern of the above number sequence.
 A Adding 6 to the next number B Adding 6 to the previous number C Substracting 6 from the previous number D Multiplying the previous by 6

2
12, x, 24, 30, 36, y, ... Find the value of x+y.
 A 18 B 22 C 42 D 60

3
List the first three prime numbers greater than 30.
 A 31, 32, 33 B 31, 33, 37 C 31, 37, 41 D 37, 41, 43

4
Find the sum of all odd numbers between 10 and 20.
 A 5 B 30 C 55 D 75

5
23, J, K, L, M, 43 are prime numbers arranged in increasing order. Which of the following is 37?
 A J B K C L D M

6
If the sum of prime factors is 10, the possible value of the number is ...
 A 20 B 25 C 30 D 35

7
The following are the common multiples of 8 and 12 except
 A 96 B 192 C 200 D 288

8
28 is a common multiple of 2 and M. M is a prime factor of 14 and 42.
What is the value of M?
 A 2 B 3 C 5 D 7

9
Find the highest common factor of 16 and 24.
 A 2 B 4 C 8 D 16

10
Given that (x-1) is the lowest common multiple of 9 and 12. Find the value of x.
 A 35 B 36 C 37 D 38

SUBJECTIVE
 1 Describe the pattern of the following number sequences:a)     8, 10, 20, 22, 44, 46, ...b)     48, 45, 47, 44, 46, 43, ... 2 Extend the following number sequences for the next two numbers.a)     1, 1, 2, 6, 24b)     3, 5, 10, 12, 24 3 List all the prime numbers between 20 and 40. 4 Find the lowest common multiple of the following numbers.a)     16 and 18b)     9, 12 and 21 5 Determine whether each of the following numbers is a common factor of the numbers in the bracket.a)     4 (24, 52)b)     6 ( 84, 106) 6 Find the sum of all prime numbers between 10 and 20. 7 List the LCM of each of the following sets of numbers by listing all the multiples:a)     8 and 12b)     12 and 16 8 Find the HCF of the following sets of numbers using prime factorisation.a)     16 and 56b)     35 and 63