Number Facts Flashcards by Chris Calleja

Q

Which of these are prime?

1,2,9

A

2

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Q

Which of these are prime?

6,11,13

A

11,13

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Q

Which of these are prime?

5,15,21

A

5

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Q

Which of these are prime?

21,25,29

A

29

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Q

Which of these are prime?

1,3,5

A

3&5

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Q

What is the divisibility test for 10?

A

ends in a 0

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Q

What is the divisibility test for 3?

A

Sum of digits is a multiple of 3

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Q

What is the divisibility test for 2?

A

The number is even or ends in 2,4,6,8,0

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Q

What is the divisibility test for 9?

A

Sum of digits is a multiple of 9

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Q

What is the divisibility test for 5?

A

Ends in 5 or 0

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Q

Prime or Composite?

91

A

composite

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Q

Prime or Composite?

66

A

composite

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Q

Prime or Composite?

71

A

Prime

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Q

Prime or Composite?

51

A

composite

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Q

What is the square of?

4

A

16

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Q

What is the square of?

10

A

100

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Q

What is the square of?

3

A

9

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Q

What is the square of?

5

A

25

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Q

What is the square of?

7

A

49

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Q

What is the square of?

1

A

1

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Q

What is the square of?

2

A

4

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Q

What is the cube of?

1

A

1

Q

What is the cube of?

2

A

8

Q

What is the cube of?

3

A

27

Q

What is the square of?

9

A

81

Q

What are the factors of?

12

A

1&12

2&6

3&4

Q

What are the factors of?

14

A

1&14

2&7

Q

What are the factors of?

25

A

1&25

5

Q

What are the factors of?

16

A

1&16

2&8

4

Q

What is the 5th multiple of 5

A

25

Q

What are the first 3 multiples of 6

A

6,12,18

Q

What is the 5th multiple of 4?

A

20

Q

What are the first 3 multiples of 3?

A

3,6,9

Q

What is the 8th multiple of 3?

A

24

Q

What is the prime factorisation of?

12

A

2 x 2 x 3

or

2² x 3

Q

What is the prime factorisation of?

20

A

2 x 2 x 5

or

2² x 5

Q

What is the prime factorisation of?

30

A

2 x 3 x 5

Q

What is the prime factorisation of?

28

A

2 x 2 x 7

or

2² x 7

Q

What is the prime factorisation of?

32

A

2 x 2 x 2 x 2 x 2

or

2⁵

Q

What is the highest common factor of?

5,15

A

5

Q

What is the highest common factor of?

12,18

A

6

Q

What is the highest common factor of?

12,20

A

4

Q

What is the highest common factor of?

18,27

A

9

Q

What is the lowest common multiple of?

4,5

A

20

Q

What is the lowest common multiple of?

3,6

A

6

Q

What is the lowest common multiple of?

4,12

A

12

Q

What is the lowest common multiple of?

3,8

A

24

Q

A

11

Q

A

8

Q

A

6

Q

A

9

Q

A

12

Q

A