Number System

1

How many prime numbers are there between 1 and 10?

A 2 B 3 C 4 D 5

2

Which of the following is an integer?

A 2.5 B -3 C 0.75 D 1/2

3

Which number is neither prime nor composite?

A 0 B 1 C 2 D 3

4

Which numbers are divisible by 5?

A 25 B 30 C 35 D 42

5

What is the LCM of 3 and 7?

A 10 B 14 C 21 D 28

6

What is the smallest whole number?

A 0 B 1 C -1 D 2

7

Which of the following is a composite number?

A 7 B 13 C 21 D 23

8

Which number is divisible by 2?

A 101 B 133 C 246 D 357

9

Which of the following is a natural number?

A 0 B -1 C 5 D 1.5

10

Which of the following is a prime number?

A 4 B 9 C 11 D 15

11

What is the sum of the first four natural numbers?

A 6 B 10 C 14 D 20

12

Which of the following is a prime number?

A 9 B 15 C 19 D 21

13

Which of the following is a prime number?

A 27 B 33 C 37 D 39

14

Which of the following are divisible by 9?

A 18 B 27 C 36 D 45

15

Which number is a multiple of 5?

A 12 B 20 C 23 D 31

16

Which numbers are multiples of both 3 and 4?

A 12 B 24 C 36 D 48

17

What are the factors of 12?

A 1,2,3,4,6,12 B 1,2,3,6,12 C 2,3,4,6 D 1,3,4,6,12

18

What are the factors of 28?

A 1,2,4,7,14,28 B 1,2,4,14,28 C 2,4,7,14 D 1,7,14,28

19

Simplify: 5 + 3 × (8 - 6)

A 8 B 11 C 14 D 17

20

Which number is divisible by both 2 and 3?

A 16 B 22 C 24 D 28

21

Which of the following are odd numbers?

A 3 B 7 C 11 D 14

22

Simplify: 7 × (5 + 3)

A 40 B 56 C 63 D 72

23

Which numbers are integers?

A -4 B 0 C 1.5 D 9

24

How many factors does 16 have?

A 3 B 4 C 5 D 6

25

Which numbers are multiples of 8?

A 16 B 24 C 30 D 40