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Greatest Common Factor

Quiz by Carolyn Kay

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Q 1/20
Score 0
The factors of 18 and 27 are 1, 2, 3, 6, 9, 18 and 1, 3, 9, 27. This means the greatest common factor of 18 and 27 is...
29
54
1
3
9

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20 questions

Show answers

Q1
The factors of 18 and 27 are 1, 2, 3, 6, 9, 18 and 1, 3, 9, 27. This means the greatest common factor of 18 and 27 is...
54
1
3
9
45s
Q2
If two numbers are consecutive, then their GCF will be 1 (so for example the GCF of 6 and 7 is 1).
true
false
True or False
45s
Q3
What is the greatest common factor (GCF) of 10 and 15?
5
1
2
30
45s
Q4
What is the GCF of 3 and 4?
12
3
1
4
45s
Q5
What is the GCF of 4 and 5?
5
4
20
1
45s
Q6
What is the GCF of 14 and 28?
7
2
14
4
45s
Q7
If one number is a multiple of another, then their GCF will be the same as the smaller number (so the GCF of 20 and 60 would be 20).
true
false
True or False
45s
Q8
What is the greatest common factor of 40 and 24?
6
5
8
2
45s
Q9
What is the GCF of 6 and 20?
2
45s
Q10
The GCF of 5 and 15 is...
1
75
15
5
45s
Q11
The GCF of 12 and 14 is...
2
45s
Q12
The GCF of two numbers is always one of those numbers.
false
true
True or False
45s
Q13
The GCF of 15 and 25 is...
15
5
1
25
45s
Q14
The GCF of two prime numbers is always 1.
False
boolean:True
45s
Q15
What is the GCF of 10 and 20?
20
200
1
10
45s

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