Sasi Math (Revised for 1024)

Scroll:Number theory >> Prime factorisation >> mcq (3753)

Written Instructions:

For each Multiple Choice Question (MCQ), four options are given. One of them is the correct answer. Make your choice (1,2,3 or 4). Write your answers in the brackets provided..

For each Short Answer Question(SAQ) and Long Answer Question(LAQ), write your answers in the blanks provided.

Leave your answers in the simplest form or correct to two decimal places.

What is the prime factorisation of 20

1) 2 x 2 x 5
2) 2 x 2 x 2 x 5
3) 5 x 2
4) 2 x 2 x 10

( )

What is the prime factorisation of 3

1) 2 x 2
2) 3
3) 2 x 3
4) 2 x 2 x 2

( )

What is the prime factorisation of 12

1) 2 x 2 x 3
2) 2 x 2
3) 2 x 2 x 3 x 3
4) 2 x 3

( )

What is the prime factorisation of 8

1) 2 x 2
2) 2 x 2 x 2
3) 2 x 2 x 4
4) 4

( )

What is the prime factorisation of 6

1) 2 x 2 x 3
2) 2 x 3
3) 2 x 6
4) 3 x 6

( )

What is the prime factorisation of 10

1) 2 x 5
2) 10
3) 2 x 2 x 5
4) 5

( )

What is the prime factorisation of 18

1) 2 x 3
2) 2 x 3 x 3
3) 2 x 2 x 3 x 3
4) 3 x 3

( )

What is the prime factorisation of 16

1) 2 x 2 x 2
2) 2 x 2 x 2 x 2 x 2
3) 2 x 4
4) 2 x 2 x 2 x 2

( )

What is the prime factorisation of 2

1) 2 x 2 x 2
2) 2
3) 2 x 2
4) 2 x 3

( )

10)

What is the prime factorisation of 5

1) 5
2) 3 x 3
3) 2 x 2
4) 2 x 3

( )

What is the prime factorisation of 20

1) 5 x 2
2) 2 x 2 x 10
3) 2 x 2 x 5
4) 2 x 2 x 2 x 5

Answer: 3

SOLUTION 1 :

Remember:

A prime factorisation shows how to write a number as the product of prime factors.

Slove:

Divide by prime factors until the quotient is 1.

20 ÷ 2 = 10

10 ÷ 2 = 5

5 ÷ 5 = 1

The prime factorisation of 20 is:

20 = 2 × 2 × 5

What is the prime factorisation of 3

1) 3
2) 2 x 3
3) 2 x 2
4) 2 x 2 x 2

Answer: 1

SOLUTION 1 :

Remember:

A prime factorisation shows how to write a number as the product of prime factors.

Slove:

3 is a prime number. The prime factorisation of 3 is 3.

What is the prime factorisation of 12

1) 2 x 3
2) 2 x 2 x 3 x 3
3) 2 x 2
4) 2 x 2 x 3

Answer: 4

SOLUTION 1 :

Remember:

A prime factorisation shows how to write a number as the product of prime factors.

Solve:

Divide by prime factors until the quotient is 1.

12 ÷ 2 = 6
6 ÷ 2 = 3
3 ÷ 3 = 1

The prime factorisation of 12 is:

12 = 2 × 2 × 3

What is the prime factorisation of 8

1) 2 x 2
2) 2 x 2 x 4
3) 2 x 2 x 2
4) 4

Answer: 3

SOLUTION 1 :

Remember:

A prime factorisation shows how to write a number as the product of prime factors.

slove:

Divide by prime factors until the quotient is 1.

8 ÷ 2 = 4
4 ÷ 2 = 2
2 ÷ 2 = 1

The prime factorisation of 8 is:

8 = 2 × 2 × 2

What is the prime factorisation of 6

1) 2 x 6
2) 2 x 3
3) 3 x 6
4) 2 x 2 x 3

Answer: 2

SOLUTION 1 :

Remember:

A prime factorisation shows how to write a number as the product of prime factors.

Slove:

Divide by prime factors until the quotient is 1.

6 ÷ 2 = 3
3 ÷ 3 = 1

The prime factorisation of 6 is:

6 = 2 × 3

What is the prime factorisation of 10

1) 5
2) 10
3) 2 x 5
4) 2 x 2 x 5

Answer: 3

SOLUTION 1 :

Remeber:

A prime factorisation shows how to write a number as the product of prime factors.

Slove:

Divide by prime factors until the quotient is 1.

10 ÷ 2 = 5
5 ÷ 5 = 1

The prime factorisation of 10 is:

10 = 2 × 5

What is the prime factorisation of 18

1) 2 x 2 x 3 x 3
2) 3 x 3
3) 2 x 3 x 3
4) 2 x 3

Answer: 3

SOLUTION 1 :

Remember:

A prime factorisation shows how to write a number as the product of prime factors.

Slove:

Divide by prime factors until the quotient is 1.

18 ÷ 2 = 9
9 ÷ 3 = 3
3 ÷ 3 = 1

The prime factorisation of 18 is:

18 = 2 × 3 × 3

What is the prime factorisation of 16

1) 2 x 2 x 2
2) 2 x 4
3) 2 x 2 x 2 x 2 x 2
4) 2 x 2 x 2 x 2

Answer: 4

SOLUTION 1 :

Remember:

A prime factorisation shows how to write a number as the product of prime factors.

Slove:

Divide by prime factors until the quotient is 1.

16 ÷ 2 = 8
8 ÷ 2 = 4
4 ÷ 2 = 2
2 ÷ 2 = 1

The prime factorisation of 16 is:

16 = 2 × 2 × 2 × 2

What is the prime factorisation of 2

1) 2
2) 2 x 3
3) 2 x 2
4) 2 x 2 x 2

Answer: 4

SOLUTION 1 :

Remember:

A prime factorisation shows how to write a number as the product of prime factors.

Slove:

2 is a prime number. The prime factorisation of 2 is 2.

10)

What is the prime factorisation of 5

1) 3 x 3
2) 5
3) 2 x 3
4) 2 x 2

Answer: 2

SOLUTION 1 :

Remember:

A prime factorisation shows how to write a number as the product of prime factors.

Slove:

5 is a prime number. The prime factorisation of 5 is 5.