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

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