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

What is the square of? 9

81

What are the factors of? 12

1&12 2&6 3&4

What are the factors of? 14

1&14 2&7

What are the factors of? 25

1&25 5

What are the factors of? 16

1&16 2&8 4

What is the 5th multiple of 5

25

What are the first 3 multiples of 6

6,12,18

What is the 5th multiple of 4?

20

What are the first 3 multiples of 3?

3,6,9

What is the 8th multiple of 3?

24

What is the prime factorisation of? 12

2 *x* 2 *x 3* *or* 2² *x 3*

What is the prime factorisation of? 20

2 *x* 2 *x 5* *or* 2² *x* 5

What is the prime factorisation of? 30

2 *x* 3 *x* 5

What is the prime factorisation of? 28

2 *x* 2 *x* 7 or 2² *x* 7

What is the prime factorisation of? 32

2 *x* 2 *x* 2 *x* 2 *x* 2 or 2⁵

What is the highest common factor of? 5,15

5

What is the highest common factor of? 12,18

6

What is the highest common factor of? 12,20

4

What is the highest common factor of? 18,27

9

What is the lowest common multiple of? 4,5

20

What is the lowest common multiple of? 3,6

6

What is the lowest common multiple of? 4,12

12

What is the lowest common multiple of? 3,8

24

11

8

6

9

12