Factors
What are factors?
Factors are the numbers being multiplied in a multiplication problem.
What is the definition of a prime number?
A prime number is a whole number greater than 1 that has EXACTLY two factors, itself and 1.
What is the definition of a composite number?
A composite number is a whole number greater than 1 that has MORE than two different factors.
What are multiples?
A multiple is the the result of multiplying a number by another number.
Is the number 1 a prime or composite number?
The number 1 is NEITHER prime or composite.
What are the factors of 21?
The factors of 21 are...
1 x 21
3 x 7
Which of the following numbers is PRIME?
What are its factors?
10 or 11
The number 11 is prime. 11's factors are 1 and 11.
Which of the following numbers is COMPOSITE?
What are its factors?
23 or 25
The number 25 is composite. It has the factors, 1,5, and 25.
What are the first five multiples of 7.
The first 5 multiples of 7 are 7, 14, 21, 28, and 35.
True or False.
All odd numbers have ONLY odd factors.
True. Odd numbers do not have even factors.
What are the factors of 24?
The factors of 24 are...
1 x 24
2 x 12
3 x 8
4 x 6
True or False.
All prime numbers are odd.
False- The number 2 is the only even prime number.
True or False.
Composite numbers can be odd or even.
True - Both odd and even numbers can be composite if they have more than 2 factors.
Which number is NOT a multiple of 4.
4 8 16 22 28
The number 22 is not a multiple of 4.
Is the number 262 prime or composite?
The number 262 is composite. All even numbers, other than 2, are composite.
Frank lists the factors of 18 as 1,3,6,18.
What factor pair did Frank miss?
Frank missed the factor pair 2 x 9
Which set of numbers contains only prime numbers?
A - 3 , 5 , 11 , 15
B - 3 , 5 , 13 , 17
Set B contains only prime numbers. The number 15 is composite in set A.
Which set of numbers contains only composite numbers?
A - 4 , 8 , 9 , 51
B - 6 , 10 , 29 , 45
Set A contains only composite numbers. The number 29 is prime in set B.
True or False.
63 a multiple of 9.
True. 9 x 7 = 63.
True or False.
Multiples are never ending.
True. Multiples can go on forever.
Liliana lists the factors of 51 as 3,17,51.
Is Liliana correct? Explain why or why not.
Liliana is incorrect.
ALL products have a factor of 1.
Name the prime numbers between 35 and 45.
The prime numbers between 35 and 45 are 37,41, and 43.
Name the composite numbers between 50 and 55.
The composite numbers between 50 and 55 are 50,51,52,54, and 55.
Name 2 different numbers that have 16 , 32, and 40 as multiples.
The numbers 2 , 4, and 8 would all have 16, 32, and 40 as multiples.
What are the first 5 multiples of 17.
The first 5 multiples of 17 are 17 , 34, 51, 68, and 85.