Quiz about Prime factors, LCM, HCF

Question 1

A prime number is...

Accepted Answer

a number that has only two factors.
(1 and itself)

Answer

a number that has only one factor.

Answer

a number that has at least two factors.

Answer

a number that has more than two factors.

Question 2

Joe has listed the first 4 multiples of 7 as:
7 14 22 28
Which one is incorrect?

Accepted Answer

22

Answer

7

Answer

14

Answer

28

Question 3

Find the HCF of 21 and 28

Accepted Answer

7

Answer

3

Answer

4

Answer

14

Question 4

Which answer lists all the factors for 40?

Accepted Answer

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

Answer

1,2,4,5,8,12,14,40

Answer

1,2,3,4,5,8,10

Answer

1,2,4,5,6,7,8,9,10

Question 5

Find the LCM of 12 and 16...

Accepted Answer

48

Answer

36

Answer

64

Answer

96

Question 6

Which of these numbers is not prime?

Accepted Answer

25

Answer

17

Answer

23

Answer

37

Question 7

Name the 5th prime number.

Accepted Answer

11

Answer

2

Answer

5

Answer

7

Question 8

Find the HCF for 18, 36, and 81

Accepted Answer

9

Answer

3

Answer

2

Answer

6

Question 9

Sophie checks her bike for repairs every 9 days and Susan check hers every 12 days. If they both check their bikes today, after how many days do they next both check their bike again?

Accepted Answer

LCM

Answer

HCF

Question 10

There are two loaf cakes. One is 35cm long and one is 21cm long. They want to cut the cake up and sell the slices, but all the slices must be equal. What is the largest slices that they can cut them into?

Accepted Answer

HCF

Answer

LCM

Question 11

A carpenter got given some free wooden planks. Some are 12m long and some are 18m long. She wants to cut them up so that she has equal size planks to make using them easier. What size planks should she cut them into to avoid wasting any wood?

Accepted Answer

HCF

Answer

LCM

Question 12

Tom and Claire both like do short exercise that involve small breaks. Tom does a short burst of exercise every 2 minutes, and Claire does hers every 3 minutes. If they start doing their exercise at 9:00am, when do they both do their exercises again?

Accepted Answer

LCM

Answer

HCF

Question 13

51 is a _____________ of 3

Accepted Answer

Multiple

Answer

Factor

Question 14

What number is a factor for EVERY number?

Accepted Answer

1

Answer

0

Answer

2

Answer

100

Question 15

Four bells ring at intervals of 6, 7, 8 and 9 seconds respectively. After how many seconds do all the bells ring together?

Accepted Answer

504

Answer

508

Answer

512

Answer

516

Question 16

The lowest common multiple of 8,16 and p is 48. What is the possible value of p?

Accepted Answer

24

Answer

2

Answer

32

Answer

64

Question 17

Mary has 24 pastries and wants to share pastries with her 20 friends. The greatest number of pastries any friend can get

Accepted Answer

4

Answer

2

Answer

5

Answer

6

Question 18

Melanie and Martin are both building a toy train track out of connecting pieces. Melanie has pieces that are 8 cm long while Martin's pieces are 20 cm long. How long will the shortest track be that they can each build with the same length?

Accepted Answer

40

Answer

2

Answer

4

Answer

20

Question 19

write 140 as th product of its prime factors

Accepted Answer

2x2x5x7

Answer

2x2x2x2

Answer

3x2x3x5

Answer

7x9x5x2

Question 20

A number is expressed as

2³x 3³x 5.

What is the number?

Accepted Answer

1080

Answer

11

Answer

72

Answer

270

Question 21

How should you express 96 as a product of its prime factors?

Accepted Answer

3 x 25

Answer

32 x 3

Answer

2 x 48

Answer

1 x 2⁵x 3

Question 22

What is 720 as a product of its prime factors?

Accepted Answer

2⁴ x 3² x 5

Answer

16 x 3³x 5

Answer

2³ x 4² x 3

Answer

26 x 7

Question 23

Find the LCM of 120 and 150.

Accepted Answer

600

Answer

300

Answer

360

Answer

450

Question 24

Find the HCF of 32 and 80.

Accepted Answer

16

Answer

8

Answer

24

Answer

32

Question 25

What is the HCF of 72 and 120

Accepted Answer

24

Answer

22

Answer

26

Answer

28

Question 26

What is the LCM of 72 and 108?

Accepted Answer

216

Answer

144

Answer

280

Answer

312

Question 27

Ben exercises every 12 days and Isabel every 8 days. Ben and Isabel both exercised today. How many days will it be until they exercise together again?

Accepted Answer

24

Answer

4

Answer

6

Answer

12

Question 28

Find the HCF and LCM of 15, 20 and 35.

Accepted Answer

HCF = 5 and LCM = 420

Answer

HCF = 5 and LCM = 402

Answer

HCF = 15 and LCM = 10500

Answer

HCF = 5 and LCM = 10500

Question 29

Lamp A lights up every 15 minutes and lamp B lights up every 20 minutes. If at 09.00 the two lights turn on together, the second lamp will turn on together again for the second time at ...

Accepted Answer

10.00

Answer

09.30

Answer

09.45

Answer

10.30

Question 30

Maya had 16 red flowers and 24 yellow flowers.  She wants to make bouquets with the same number of each color flower in each bouquet.  What is the greatest number of bouquets that she can make?

Accepted Answer

8

Answer

4

Answer

2

Answer

48

Question 31

Derek advises a patient to have a scale every 4 months and a polish every 6 months. If they have a scale and polish today, how long will they wait before they can have both during the same appointment?

Accepted Answer

LCM

Answer

HCF

Question 32

What is a factor?

Accepted Answer

a number that can be divided by another number without a remainder.

Answer

a number or quantity that when multiplied with another produces a given number or expression.

Answer

A Number

Answer

A number experssiona to solve a multiplication problem

SHOW ANSWER

Question 33

HCF of 8 and 11

Accepted Answer

1

Answer

11

Answer

88

Answer

8

Prime factors, LCM, HCF

35 questions

A prime number is...

Joe has listed the first 4 multiples of 7 as:
7 14 22 28
Which one is incorrect?

Find the HCF of 21 and 28

Which answer lists all the factors for 40?

Find the LCM of 12 and 16...

Which of these numbers is not prime?

Name the 5th prime number.

Find the HCF for 18, 36, and 81

Sophie checks her bike for repairs every 9 days and Susan check hers every 12 days. If they both check their bikes today, after how many days do they next both check their bike again?

There are two loaf cakes. One is 35cm long and one is 21cm long. They want to cut the cake up and sell the slices, but all the slices must be equal. What is the largest slices that they can cut them into?

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Prime factors, LCM, HCF

35 questions

A prime number is...

Joe has listed the first 4 multiples of 7 as: 7 14 22 28Which one is incorrect?

Find the HCF of 21 and 28

Which answer lists all the factors for 40?

Find the LCM of 12 and 16...

Which of these numbers is not prime?

Name the 5th prime number.

Find the HCF for 18, 36, and 81

Sophie checks her bike for repairs every 9 days and Susan check hers every 12 days. If they both check their bikes today, after how many days do they next both check their bike again?

There are two loaf cakes. One is 35cm long and one is 21cm long. They want to cut the cake up and sell the slices, but all the slices must be equal. What is the largest slices that they can cut them into?

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Mathematics

Joe has listed the first 4 multiples of 7 as:
7 14 22 28
Which one is incorrect?