Greatest Common Factor

QuizÂ by Carolyn Kay

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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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