Factors
List all the factors of 12
1, 2, 3, 4, 6 ,12
List the first 5 multiples of 3.
3, 6, 9, 12, 15
Is 15 a multiple of 5? Prove it using multiplication or division!
Yes, because 3X5=15 or 15/ 5 = 3
What is the definition of a prime number?
What is the definition of a composite number?
Prime= only factors are 1 and itself
Composite= has more than 2 factors
I am an even prime number. Who am I?
2
List all the factors of 36.
1, 2, 3, 6, 12, 18, 36
List the first 5 multiples of 6.
6, 12, 18, 24, 30
Is 36 a multiple of 3?
Yes because 3 X 12= 36 and 36 / 3= 12
Is 13 a prime or composite number? Show your thinking.
Prime because it's only factors are 1 and 13.
Possible or Impossible?
A factor of 50 between 11 and 20.
Impossible
What are the common factors between 15 and 24?
1 and 3
List the first 10 multiples of 7.
7, 14, 21, 28, 35, 42, 49, 56, 63, 70
Is 42 a multiple of 9?
No, because 9 X 5= 45 and 9 X 4 = 36
Is 63 a prime or composite number? Show your thinking.
Possible or impossible?
An odd multiple of 6 which is lesson than 100.
Impossible
What are the common factors between 36 and 45?
1, 3, 9
What is the smallest common multiple for the factors 2 and 5?
10
Is 75 a multiple of 6?
No because 75 / 6 = 12 R3
Possible or Impossible?
An odd prime number between 32 and 36.
Show your thinking.
Impossible.
I am the largest prime number which is less than 36.
Who am I?
31
What is the greatest common factor between 28 and 49?
7
The factors of a multiple are:
1, 2, 4, 8, 16
What is the multiple?
16
Is 142 a multiple of 6?
No because 142 / 6 = 23 R 4
I am a prime number less than 40. The sum of my digits is 8. Who am I?
17
I am an even number greater than 7. I am also a common factor of 12 and 36.
Who am I?
12