Mathematics for IGCSE & O level - Number (Section 3)
1
What is the LCM of 84 and 180?
Απάντηση
(C)
1260
2
What is the value of k in 96k, given that 96k is a square number?
Απάντηση
(C)
6
3
Which of the following is a rational number?
Απάντηση
(D)
0.46
4
If two lighthouses flash every 22 and 16 seconds, at what time will they flash together again if they flashed at 10 pm?
Απάντηση
(C)
10:04:48
5
What is the lowest common multiple (LCM) of 20 and 50?
Απάντηση
(C)
100
6
What is the HCF of 5544 and 2268?
Απάντηση
(D)
168
7
Which of the following numbers is a prime number?
Απάντηση
(C)
11
8
Buses to Shenley leave every 40 minutes and buses to Winley leave every 15 minutes. If buses to both places leave at 8.15 a.m., when is the next time they leave at the same time?
Απάντηση
(D)
9.45 a.m.
9
What is the reciprocal of 1/4?
Απάντηση
(B)
4
10
What is the HCF of 84 and 180?
Απάντηση
(C)
12
11
What is the value of k in 392k, given that 392k is a cube number?
Απάντηση
(B)
3
12
What is the LCM of 45, 60, and 75?
Απάντηση
(B)
900
13
Which of the following is a prime number?
Απάντηση
(C)
23
14
Which of the following is an Irrational Number?
Απάντηση
(D)
√12
15
What is the value of k in 96k, given that 96k is a cube number?
Απάντηση
(B)
3
16
Find the largest possible side length for squares, given that a rectangle measures 240mm by 204mm.
Απάντηση
(D)
12 mm
17
What is the next time that the lights flash at the same time if the lights flash every 22 and 16 seconds respectively? Both lights switched on at 10 p.m.
Απάντηση
(B)
10:04:48 p.m.
18
What is the result of expressing 0.666... as a fraction?
Απάντηση
(B)
2/3
19
Which of the following are common multiples?
Απάντηση
B
D
20
Find the largest possible side length for the identical squares that will make up a 240 mm by 204 mm rectangle.
Απάντηση
(C)
12 mm
21
Which of the following numbers is NOT a natural number?
Απάντηση
(C)
0
22
Which is the product of prime factors of 144?
Απάντηση
(C)
2^4 x 3^2
23
Which of the following statements are true about a common factor of two numbers?
Απάντηση
A
D
24
What is the HCF of 260 and 300?
Απάντηση
(B)
10
25
What do you call the largest number that is a factor of two or more numbers?
Απάντηση
(B)
Highest Common Factor
26
Which of the following best describes an Irrational number?
Απάντηση
(C)
A number that cannot be written as a fraction.
27
Which of the following numbers is a prime number?
Απάντηση
(C)
17
28
Which of the following is NOT a common multiple of 2 and 5?
Απάντηση
(D)
15
29
What is the HCF of 45, 60, and 75?
Απάντηση
(C)
15
30
What do you call the smallest number that is a multiple of two or more numbers?
Απάντηση
(D)
Lowest Common Multiple
31
What is the lowest common multiple (LCM) of 2 and 5?
Απάντηση
(D)
10
32
What is the highest common factor (HCF) of 20 and 50?
Απάντηση
(C)
10
33
What is the highest common factor (HCF) of 48 and 84?
Απάντηση
(C)
12
34
If the HCF of two numbers is 4, which of the following could be the two numbers?
Απάντηση
(B)
12 and 20
35
Which of the following is NOT a rational number?
Απάντηση
(C)
π
36
Which of the following is an example of a natural number?
Απάντηση
(C)
1
37
Which of the following is NOT a factor of 24?
Απάντηση
(D)
7
38
Which set of numbers contains only natural numbers?
