Factors, Powers And Standard Form Worksheet Page 5
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21Exercise 10C
E
1
Write down all the factors of
a
b
c
d
10
18
24
30
2
John says that the factors of 12 are 2, 3, 4 and 6.
Is he correct? Give a reason for your answer.
3
Choose a number from the cloud which is
16
a
a factor of 36
b
a multiple of 7
30
8
6
c
a factor of 40 and a multiple of 10
20
28
d
a factor of 24 and a factor of 16.
E
4
Mike says that every number has an even number of factors.
Is he correct? Give a reason for your answer.
2
AO
Prime numbers
A number with exactly two factors is called a prime number. The factors are always 1 and the
number itself.
The fi rst few prime numbers are 2, 3, 5, 7, 11, …
1 is not a prime number. It only
A prime number which is a factor of another
has one factor.
number is called a prime factor.
2 is the only even prime number.
Example 4
E
a
Is 27 a prime number? Give a reason for your answer.
b
Write down two prime numbers which add up to 18.
a 3 3 9 5 27
27 has four factors: 1, 3, 9, 27.
27 is not a prime number.
There is more than one answer to part b.
b 11 and 7
11 1 7 5 18
13 1 5 5 18
Exercise 10D
E
1
Write down a multiplication fact to show that each number is not a prime number.
a
b
c
d
e
f
15
21
63
121
33
91
2
Write down all the prime numbers between 30 and 50.
3
Write down two prime numbers which add up to 16.
4
Write down all the prime factors of
a
b
c
d
12
30
70
44
162
Factors, powers and standard form
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