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Level 5-6 Algebra - Prime Numbers
Is 14 a prime number?

Level 5-6 Algebra - Prime Numbers

In KS3 Maths, you'll encounter different types of numbers like integers, natural numbers, fractions, and even letters used in algebra. One special group you'll meet is the prime numbers.

So, what's a prime number? It's a whole number with exactly two factors - just itself and 1. For example, 2, 3, 5, 7, and 11 are the first five primes. Do you know the sixth?

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Prime numbers are unique because they don't show up in any times tables except their own. But remember, 1 isn't a prime because prime numbers have two factors, and 1 only has itself.

Take this quiz on prime numbers to test your understanding. Read each question carefully before choosing your answer. Check out the comments after each question – they might help clarify anything you're unsure about. Best of luck!

1.
What is the next prime number after 43?
44
45
46
47
You'd do well to memorise the first 30 or so prime numbers
2.
Which of these numbers is a prime number?
4
7
9
12
All the incorrect answers have three or more factors
3.
The word 'prime' is an abbreviation for what?
Primary
Primative
Priority
It is not an abbreviation
Prime is a word in its own right
4.
Which of these is a prime number?
33
35
37
39
35 appears in the 5 and the 7 times tables, 33 is in the 3 and 11 times tables and 39 (which may have tricked you) is divisible by 13 and 3
5.
Is there an easy way to work out which numbers are prime?
Yes
No
Sometimes
Only if you are a genius
Unfortunately you have to either learn the numbers or work them out
6.
Is the number 1 a prime number?
Yes, because it is a positive whole number
No
Sometimes
Yes, because it is only divisible by itself and 1
The number 1 has only one factor - itself. Remember the rule, a prime number has TWO factors itself AND 1
7.
Which of these is not a prime number?
13
15
17
19
15 can be divided by 3 and 5 as well as 1 and 15
8.
The number 24 has eight factors. Seven of the factors are 1, 2, 3, 4, 6, 12 and 24. What is the missing factor?
5
8
10
14
All the numbers given (along with the correct answer, 8) can be divided into 24 with the result that the answer is a whole number
9.
What is the next prime number after 97?
98
99
100
101
1 and 101 are the only factors of 101 and therefore it is a prime number
10.
Is the number 14 a prime number?
Yes
No
Yes, because it is divisible by 2
It depends which way you look at it
There are four factors of 14 - the numbers 1, 2, 7 and 14. Because there are more than two factors, it cannot be a prime number
You can find more about this topic by visiting BBC Bitesize - Prime numbers, factors and multiples

Author:  Frank Evans
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