### Numbers and ages mcq

What is the square root of 144?

a) 9

b) 12

c) 16

d) 18

Answer: b) 12

Which of the following is a prime number?

a) 12

b) 17

c) 24

d) 35

Answer: b) 17

What is the value of π (pi) rounded to two decimal places?

a) 2.71

b) 3.14

c) 3.50

d) 3.75

Answer: b) 3.14

What is the sum of the first 10 natural numbers?

a) 45

b) 50

c) 55

d) 60

Answer: c) 55

If x + 5 = 12, what is the value of x?

a) 5

b) 6

c) 7

d) 8

Answer: d) 8

Which of the following is a composite number?

a) 5

b) 11

c) 13

d) 16

Answer: d) 16

What is the largest prime number less than 20?

a) 13

b) 15

c) 17

d) 19

Answer: d) 19

What is the cube of 5?

a) 125

b) 150

c) 175

d) 200

Answer: a) 125

If 3x + 4 = 19, what is the value of x?

a) 3

b) 5

c) 7

d) 9

Answer: b) 5

Which of the following is a perfect square?

a) 18

b) 25

c) 36

d) 49

Answer: b) 25

If a person is 24 years old and their sibling is half their age, how old is the sibling?

a) 8

b) 12

c) 16

d) 20

Answer: b) 12

What is the product of 7 and 9?

a) 56

b) 63

c) 72

d) 81

Answer: b) 63

If 4x + 3 = 15, what is the value of x?

a) 2

b) 3

c) 4

d) 5

Answer: a) 2

What is the least common multiple of 6 and 8?

a) 12

b) 18

c) 24

d) 48

Answer: c) 24

What is the value of 5! (factorial)?

a) 10

b) 20

c) 30

d) 120

Answer: d) 120

If a person is currently 30 years old, how old will they be in 10 years?

a) 30

b) 35

c) 40

d) 45

Answer: c) 40

Which of the following is a prime number?

a) 22

b) 27

c) 31

d) 36

Answer: c) 31

What is the square of 9?

a) 18

b) 27

c) 36

d) 81

Answer: d) 81

If a person is twice as old as another person, and the other person is 10 years old, how old is the first person?

a) 10

b) 15

c) 20

d) 25

Answer: c) 20

What is the remainder when 25 is divided by 7?

a) 2

b) 3

c) 4

d) 5

Answer: c) 4

If 2x – 3 = 9, what is the value of x?

a) 4

b) 6

c) 8

d) 10

Answer: b) 6

What is the cube root of 64?

a) 4

b) 6

c) 8

d) 16

Answer: a) 4

What is the value of 2^4 (2 raised to the power of 4)?

a) 4

b) 8

c) 16

d) 32

Answer: c) 16

If a person is currently 25 years old, how old were they 5 years ago?

a) 15

b) 20

c) 25

d) 30

Answer: b) 20

What is the greatest common divisor of 24 and 36?

a) 6

b) 8

c) 12

d) 24

Answer: a) 6

If a person’s age is x and their sibling’s age is y, which of the following equations represents the statement “The person is twice as old as the sibling”?

a) x = 2y

b) y = 2x

c) x + y = 2

d) x – y = 2

Answer: a) x = 2y

What is the value of 3^3 (3 raised to the power of 3)?

a) 9

b) 18

c) 27

d) 36

Answer: c) 27

If a person is currently 40 years old, how old will they be in 20 years?

a) 40

b) 50

c) 60

d) 70

Answer: c) 60

Which of the following is a composite number?

a) 7

b) 15

c) 23

d) 31

Answer: b) 15

If a person is currently 18 years old, how old were they 10 years ago?

a) 8

b) 10

c) 18

d) 28

Answer: a) 8