Factors
What is a factor?
A number that is multiplied by another number (factor) to get the product.
Factor x Factor = Product
What are the 2 words we can think of when we hear the word "multiple"?
Skip Count
What does it mean if a number is prime?
A prime number only has 2 factors (1 and itself)
Danny has 3 books. Sally has 2 times as many. How many books does Sally have?
Sally has 6 books.
3 x 2 = 6
3, 6 (skip counting)
A prime number has 10 factors.
What is a product?
A product is the answer to any multiplication problem.
Factor x Factor = Product
Is 20 a multiple of 2?
Yes!
2, 4, 6, 8, 10, 12, 14, 16, 18, 20
What does it mean if a number is composite?
A composite number has MORE than 2 factors.
Mrs. FitzGerald has 4 notebooks. Ms. Knotts has 3 times as many notebooks. How many notebooks does Ms. Knotts have?
4 x 3 =12
4, 8, 12 (skip counting)
False. Factors are numbers you multiply to get a product.
What are the factors of 10?
1, 2, 5, 10
Is 13 a multiple of 3?
No!
3, 6, 9, 12, 15
What does it mean if a number is square?
A number is square when two of the same numbers have been multiplied together. The two factors in the pair are the SAME number. The array makes a perfect square (same number of rows and columns)
Bob had 20 rulers. Fred had 4 rulers. How many times more rulers does Bob have than Fred?
Bob has 5 times as many rulers.
4, 8, 12, 16, 20 (skip counted)
I skip counted by 4 until I got to 20. I skip counted 5 times.
A composite number can have 12 factors.
True. Any number with more than 2 factors is composite.
What is the product of 4 x 6?
The product is 24
Which of the following is NOT a multiple of 4?
8
15
16
24
15 is not a multiple of 4.
4, 8, 12, 16, 20, 24
Is 14 a prime or composite number?
Is 14 square?
14 is a composite number.
It has 4 factors (1, 2, 7, 14)
14 is not a square number.
Greg had 8 pets. Vicky had 2 pets. How many times more pets does Greg have than Vicky?
Greg has 4 times as many pets.
2, 4, 6, 8 (skip counted)
I skip counted by 2 until I got to 8. I skip counted 4 times.
A number can be prime and square.
False. Prime numbers can't be square since they only have 2 factors.
2 Part Question:
1. What are the factors of 16?
2. Is 16 prime or composite? Is it square?
Factors of 16:
1, 2, 4, 8, 16
16 is a composite number.
16 is a square number.
What are the first 5 multiples of the number 6?
The first 5 multiples of the number 6 are:
6, 12, 18, 24, 32
25 is a composite number.
25 has 3 factors. (1, 5, 25)
25 is a square number (5 x 5 = 25)
Henry is 4 feet tall. The flag pole at his school is 24 feet tall. How many times as tall is the flag pole than Henry?
The flag pole is 6 times as tall as Henry.
4, 8, 12, 16, 20, 24 (skip counted)
Each time I skip count 4, thats 1 Henry. I skip counted 6 times which tells me the flag pole is 6 times as tall as Henry.
13 is a composite number.
False.
13 is a prime number because it only has 2 factors. (1, 13)