Maths 6. Factors and Primes Flashcards by Saran Shantikumar

Q

Is 2 a factor of 12?

A

Yes - 2 divides into 12

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Q

Is 3 a factor of 13?

A

No - 3 doesn’t divide into 13

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Q

Is 8 a factor of 72?

A

Yes - 8 divides into 72

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Q

Is 5 a factor of 45?

A

Yes - 5 divides into 45

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Q

Is 7 a factor of 50?

A

No - 7 doesn’t divide into 50

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Q

Is 9 a factor of 73?

A

No - 9 doesn’t divide into 73

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Q

Is 6 a factor of 24?

A

Yes - 6 divides into 24

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Q

Is 11 a factor of 121?

A

Yes - 11 divides into 121

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Q

Is 1 a factor of 351?

A

Yes - 1 divides into 351

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Q

Is 14 a factor of 31?

A

No - 14 doesn’t divide into 31

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Q

List the factors of 6

A

Listing them as pairs:

1 and 6

2 and 3

So: 1, 2, 3 and 6 are the factors of 6

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Q

List the factors of 10

A

Listing them as pairs:

1 and 10

2 and 5

So: 1, 2, 5 and 10 are the factors of 10

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Q

List the factors of 12

A

Listing them as pairs:

1 and 12

2 and 6

3 and 4

So: 1, 2, 3, 4, 6 and 12 are the factors of 12

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Q

List the factors of 25

A

Listing them as pairs:

1 and 25

5 and 5 (these are the same)

So: 1, 5 and 25 are the factors of 25

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Q

List the factors of 36

A

Listing them as pairs:

1 and 36

2 and 18

3 and 12

4 and 9

6 and 6 (these are the same)

So: 1, 2, 3, 4, 6, 9, 12, 18 and 36 are the factors of 36

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Q

Is 1 a prime number?

A

No - it only has one factor (1).

Prime numbers need to have two, and only two, factors.

Q

What is the only even prime number?

A

2

It’s factors are 1 and 2

Q

Is 13 a prime number?

A

Yes.

It only has two factors: they are 1 and 13

Q

Is 15 a prime number?

A

No.

It has more than two factors: 1, 3, 5 and 15

Q

List the prime numbers that are less than 30

A

The prime numbers less than 30 are:

2, 3, 5, 7, 11, 13, 17, 19, 23 and 29