Prime & Composite
A number that can only be multiplied by 1 and itself.
What is a prime number?
Izzy is 11 years old. Her grandma is 6 times older than Izzy. How old is her grandma?
What is 66 years old? (11x6)
36 divided by 6 = _________
6
Mrs. Williams is 5 times as old as Annie. Annie is 10 years old. Mr. Williams is 7 years older than Mrs. Williams. How old is Mr. Williams?
5 x 10 = 50
50 + 7 = 57 years old
6 x 10 =___
60
A number that has MORE factors than 1 and itself.
What is a composite number?
Luca got candy for Christmas. He got 7 pieces of candy. His sister got 3 times as much candy as Jeremy. What equation represents how much candy his sister got?
7x3=C (c represents candy)
Mrs. Smith has 24 students in her math class. Ms. Burns has half the amount of students. How many students does Ms. Burns 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?
4x4=16
20+16=36 pencils total
3 x 8 =____
24
What kind of number is 7? Prime or composite? Why?
What is a prime number because its only factors are 1 and 7?
How can you break 14 up to multiply 14 x 5?
14 x 5 = (10 + 4) x 5
10 x 5 = 50
4 x 5 = 20
50 + 20 = 70
Bentley 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
16 is a ___________ number. Because _________________________
What is a composite number because it has multiple factors (1,16,2,8,4)?
What equation represents
"35 markers are 7 times the 5 crayons at the purple table"?
7 x 5 = 35 markers
Lilliannah bought a book and a toy. The toy costed $24 and the book costed $8. How many times more than the book did the toy cost?
24 รท 8 = 3 times more
Mrs. Brahler has 5 library bins. Each bin has 6 books.
Ms. Westover has 2 library bins. Each bin has 5 books.
They need to combine their books and divide them EVENLY between the two classes? How many books will each class get?
Mrs. Brahler = 5x6=30
Ms. Westover = 2x5=10
30+10=40
40/2= 20 books each class
Fill in the blanks to complete and solve this story problem.
Mr. Logan had ____ songs that were each 3 minutes long, so the songs totaled _____ minutes of the concert.
___songs x 3 minutes = ____ total minutes
List ALL the factors for 20.
1, 2, 4, 5, 10, 20
Ms. Westover bought pants and a top. The pants were 3 times as much as the top. The top costs $15. How much were the pants?
15 x 3 = (10 + 5) x 3
10 x 3 = 30
5 x 3 = 15
30 + 15 = 45; $45
Molly 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
Make up a story problem to represent the equation 7 x 5 =35.
Example:
Sophia has 5 bracelets with 7 beads on each. How many beads are there in all?