Prime & Composite
A number that can only be multiplied by 1 and itself.
A prime number.
Jenna is 11 years old. Her grandma is 6 times older than Jenna. How old is the grandma?
66 years old? (11x6)
36 divided by 6 = _________
6
Solve.
(4x5)+(5x6)= ______
20+30=50
6 x 10 =
60
A number that has MORE than two factors - 1 and itself.
A composite number?
The equation 42 = 6 x 7 can mean (select all that apply)
a. 42 is 6 times as many as 7
b. 42 is 6 less than 7
c. 42 is twice as much as 6 times 7
d. 42 is 7 times as many as 6
a. 42 is 6 times as many as 7
and
d. 42 is 7 times as many as 6
Ms. H has 24 students in her math class. Ms. J has half the amount of students. How many students does Ms. J have?
24/2=12 students
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?
5x4=20
4x4=16
20+16=36 pencils total
3 x 8 =
24
What kind of number is 7? Prime or composite? Why?
7 is a prime number because its only factors are 1 and 7.
Ms. Green is 4 times as old as Mason. Mason is 10 years old. How old is Ms. Green?
10x4=40 years old
Jack saw 5 columns of crayons in a box of 30 markers. How many markers are in each column? Solve.
30/5=6 in each column
The 2nd grade has 60 students. The 4th grade has 2 times as many students in 2nd grade. How many MORE students are in 4th grade?
60x2=120 students
120-60=60 more students
10 x ____ = 80
8
What kind of number is 39? Prime or composite?
39 is a composite number because it has more than two factors (1, 3, 13, 39)
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?
15x3=$45 for the pants
Krista bought a book and a toy. The toy cost $24 and the book cost $8. How many times more than the book did the toy cost?
24/8=3 times more
Ms. B has 5 library bins. Each bin has 5 books.
Ms. K has 5 library bins. Each bin has 7 books.
They need to combine their books and divide them EVENLY between the library bins. How many books will each class get?
Ms. B= 5x5=25
Ms. K= 5x7=35
25+35=60 60 divided by 10= 6 books each bin
7 x ___ = 42
6
Mark writes a number
- The number is between 20 and 30
- It has exactly 6 factors
- One of the factors is 4
a. 21 b. 24 c. 28 d. 32
c. 28
What equation represents
"35 markers are 7 times the 5 crayons at the purple table"?
7x5=35 markers
Katherine needed cookies for her birthday party. Cookies came in packs of 5. She has 40 people coming to her party. How many packs of cookies will she need?
40/5=8 packs of cookies.
There are 4 students at the green table. They each brought 2 packs of markers. The class needs 4 times as much markers as the green table. How many packs of markers does the class need?
4x2=8x4=32 packs of markers
20 x 2 =
40