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

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