Definitions
What is the definition of a factor?
Two numbers that are multiplied together to get another number (3 x 4 = 12)
What are the all the factors of 10?
1, 2, 5, 10
Is 5 prime or composite? Why?
Prime - its only factors are 1 and itself
Sophie has 4 times as many erasers as Emma. If Emma has 6 erasers, how many does Sophie have?
Sophie has 24 erasers.
(6 x 4 = 24)
56
(7 x 8 = 56)
What is the definition of a multiple?
Skip counting by a number will give you multiples of that number because you are multiplying the original number by 1, 2, 3, etc.
(5, 10, 15, 20 are all multiples are 5)
Name the first 5 multiples of 6
6, 12, 18, 24, 30
Is 21 prime or composite? Why?
Composite - its factors are 1, 3, 7, 21
It takes Andrew 20 minutes to walk home from school. If it takes Miles twice as long, how many minutes does it take Miles to walk home?
It takes Miles 40 minutes to walk home.
(20 x 2 = 40)
The quotient of 36 and 12
3
(36 divided by 12 = 3)
What is the definition of a prime number?
A number that one has two factors: 1 and itself
Which of the following is NOT a factor pair of 60?
a.) 2, 30
b.) 6, 12
c.) 4, 15
d.) 3, 20
6 x 12 = 72, not 60
Is 55 prime or composite? Why?
Composite - its factors are 1, 5, 11, 55
A CD costs $5 at Music Warehouse. A DVD costs 10 times as much as the CDs. How much does a DVD cost at Music Warehouse?
A DVD at Music Warehouse costs $50.
( 5 x 10 = 50 )
Is 2 prime, composite, or neither? Explain.
2 is a prime number. It only has 2 factors: 1 and itself
What is the definition of a composite number?
A number that has more than 2 factors
True or False: a number has an infinite number of multiples
True! You can continue skip counting by a number forever.
Is 71 prime or composite? Why?
Prime - its only factors are 1 and itself
Addy had 5 times as many colored pencils as Frances. Frances had 12 colored pencils. Which equation represents the amount of colored pencils Addy had?
a.) 12 + 5 + 17
b.) 5 x 5 = 25
c.) 12 x 5 = 60
d.) 12 - 5 = 7
Addy had 60 colored pencils.
True or False? A number has an infinite number of factors.
False - a number has a finite number of factors because only certain numbers multiply together to get that number (think a factor rainbow)
A number that always has an ODD number of factors
Square number (4, 9, 16, 25, 36, 49, 64, 81, 100...)
Which of the following is NOT a multiple of 12?
a.) 12
b.) 6
c.) 24
d.) 84
b.) 6
Is 83 prime or composite? Why?
Prime - its only factors are 1 and itself
Amelia has 64 stickers. She has 4 times as many stickers as Indiana has. Which equation represents how many stickers Indiana has?
a.) 64 x 4 = 256
b.) 64 + 4 = 68
c.) 64 - 4 = 60
d.) 64 ÷ 4 = 16
d.) 64 ÷ 4 = 16
Indiana has 16 stickers.
Name one prime and one composite number and give all their factors.
Answers will vary