Prime/Composite
What is a number called that has more than 2 factors?
Composite Number
What are factors?
Factors are the numbers that multiply together to equal a given number (multiplication facts)
4 x 6 =
24
7 x __ = 28
4
Ms. Green is 4 times as old as Mason. Mason is 10 years old. How old is Ms. Green?
40
What is a number called that has 2 factors, 1 and itself?
Prime number
What are multiples?
Multiples are the products of a given number (skip counting)
8 x 6 =
48
30 x __ = 60
2
Ms. Breidenstein bought pants and a top. The pants were 3 times as much as the top. The top costs $15. How much were the pants?
$45
Is 13 prime or composite? why?
Prime because the only factors are 1 and 13
List the factors of 20
1,2,4,5,10,20
Select any statement that matches this situation: Mrs. Silver is 60. This is three times older than her daughter. How old is her daughter? (d)
a - 3 x d = 60
b - 3 x 60 = d
c - 60 - 3 = d
d - 60 / d = 3
A and D
___ x 9 = 63
7
Table 1 has 5 students. Each student has 4 pencils. Table 2 has 4 students. Each student has 4 pencils.
How many pencils do both groups have total?
36 pencils
Name a composite number
many examples
List 3 multiples of 4 (not including 4)
8,12,16,20,24,etc
Write an equation that matches this statement
28 crayons is 4 times the 7 crayons at table A.
4 x 7 = 28
7 x 4 = 28
28 / 4 = 7
28 / 7 = 4
__ x 7 = 42
6
The 2nd grade has 40 students. The 4th grade has 3 times as many students in 2nd grade. How many MORE students are in 4th grade?
80 more students
Is 21 prime or composite? Why?
Composite because it has more than 2 factors. 1,3,7,21
Which of these is a multiple of 3?
a-26
b-31
c-27
c - 27
Write a multiplicative comparison statement that matches this equation:
5 x 7 = 35
Answers will vary
56 is ___ times as many as 7.
8
There are 4 students at the green table. They each brought 2 packs of markers. The class needs 4 times as many packs of markers as the green table. How many packs of markers does the class need?
32 packs of markers