Multiples, factors, powers and roots - OCR test questions - OCR - GCSE Maths Revision

1

What are the factors of 40 in order?

5, 10, 15, 20, 25, 30, 35, 40

3, 6, 9, 12, 15, 18, 21, 24

1, 2, 4, 5, 8, 10, 20, 40

2

What are the first 5 multiples of 6?

6, 12, 18, 24, 30

6, 12, 20, 25, 30

6, 12, 19, 24, 30

3

Which of these numbers is NOT a prime number?

2

31

9

4

How do you work out the value of 3⁵?

3 × 3 × 3 × 3 × 3

3 × 5

5 × 5 × 5

5

What is \(\sqrt{64}\)?

32

8

6.4

6

Write 12 as a product of its prime factors.

2 × 6

2, 2, 3

2 × 2 × 3

7

Write 90 as the product of its prime factors

2 × 9 × 5

2 × 3 × 3 × 5

2, 3 and 5

8

Calculate the highest common factor (HCF) of 12 and 90.

6

2

180

9

Calculate the lowest common multiple (LCM) of 12 and 90.

6

1,080

180

10

A machine goes "pop" every 20 minutes and "beep" every 35 minutes." It goes "pop" and "beep" together at 12pm. When will the machine next go "pop" and "beep" together?

1:05pm

2:20pm

12:55pm