Mathematics for IGCSE & O level - Number (Section 2)

1
Which of the following is the best example of a rational number?
პასუხი
(C)
22/7
2
Which of the following numbers has the prime factorization 2 x 3 x 5 x 7?
პასუხი
(A)
210
3
What is the lowest common multiple (LCM) of 6 and 8?
პასუხი
(C)
24
4
Which number is a multiple of 7?
პასუხი
(A)
21
5
If two numbers are relatively prime, what is their HCF?
პასუხი
(B)
1
6
Which numbers are integers?
პასუხი
A
C
7
Which of the following is an irrational number?
პასუხი
(C)
π
8
Identify the correct statement:
პასუხი
(B)
All natural numbers are integers.
9
Which of these expressions results in a rational number?
პასუხი
(B)
2√2 x √2
10
What is the value of √64?
პასუხი
(C)
8
11
Which of the following expressions results in a rational number?
პასუხი
(B)
√2 x √2
12
Which number is a factor of 48, but not a factor of 36?
პასუხი
(D)
8
13
What is the reciprocal of 4?
პასუხი
(A)
1/4
14
Which of the following statements regarding the Highest Common Factor (HCF) and Lowest Common Multiple (LCM) is correct?
პასუხი
(C)
The product of HCF and LCM of two numbers equals the product of the two numbers.
15
If a = 2^2 x 3 x 5 and b = 2 x 3^2 x 7, what is the HCF of a and b?
პასუხი
(B)
12
16
What is the next prime number after 19?
პასუხი
(B)
23
17
What is the HCF of 72 and 108?
პასუხი
(C)
36
18
Which of the following is the same as 0.75?
პასუხი
(C)
3/4
19
A number is divisible by both 2 and 3. What can you conclude about the number?
პასუხი
(C)
It is divisible by 6.
20
What is the value of 3. 5 x 4 - 2?
პასუხი
(C)
14
21
What is the smallest number that has factors of 2, 3, and 5?
პასუხი
(C)
30
22
What is the value of 3^2 + 2^3?
პასუხი
(B)
17
23
Which number is a prime number?
პასუხი
(C)
17
24
Which of these numbers is both a factor of 60 and a multiple of 3?
პასუხი
(B)
6
25
What is the result of 12 ÷ (3 + 1) x 2?
პასუხი
(B)
6
26
Which of these numbers is not a factor of 27?
პასუხი
(D)
6
27
Which number below is an irrational number?
პასუხი
(C)
2.71828...
28
Which of the following statements is true?
პასუხი
(B)
All natural numbers are integers.
29
What is the reciprocal of -3?
პასუხი
(C)
-1/3
30
Which of the following is an example of a terminating decimal?
პასუხი
(C)
5.81
31
Which of the following could be written as a fraction?
პასუხი
(B)
0.333...
32
What is the value of k in 392k, given that 392k is a cube number?
პასუხი
(B)
3
33
What is the product of prime factors of 27?
პასუხი
(B)
3 x 3 x 3
34
What is the Highest Common Factor (HCF) of 50 and 64?
პასუხი
(B)
2
35
If a number is rational, then it can be expressed as:
პასუხი
(B)
A fraction a/b where a and b are integers and b ≠ 0
36
What is the product of prime factors of 72?
პასუხი
(C)
2^3 x 3^2
37
What is the LCM of 27 and 63?
პასუხი
(B)
189
38
What is the product of the prime factors of 25?
პასუხი
(B)
5 x 5
39
What is the product of prime factors of 12?
პასუხი
(C)
2 x 2 x 3
40
Which of the following can be written as a fraction?
პასუხი
(D)
0.125
41
What is the product of prime factors of 198?
პასუხი
(B)
2 x 3^2 x 11
42
What is the reciprocal of 2/3?
პასუხი
(B)
3/2
43
Which of the following are the prime factors of 100?
პასუხი
A
C
44
What is the Lowest Common Multiple (LCM) of 42 and 49?
პასუხი
(C)
294
45
What is the highest common factor (HCF) of 8 and 12?
პასუხი
(B)
4
46
What is the product of prime factors of 210?
პასუხი
(A)
2 x 3 x 5 x 7
47
What is the product of prime factors of 350?
პასუხი
(B)
2 x 5^2 x 7
48
What is the HCF of 2016 and 10584?
პასუხი
(D)
336
49
Which is the product of prime factors of 100?
პასუხი
(B)
2^2 x 5^2
50
What is the value of k in 96k, given that 96k is a square number?
პასუხი
(C)
6