Factors & multiples
What are the factors of 12?
1, 2, 3, 4, 6, 12
3 x 8 =
5 x __ = 25
4 x ___ = 200
24
5
50
100 divided by 4 = ?
25
Is 12 a prime or composite number? How do you know?
Composite - it has 6 factors (3 factor pairs)
There was a sale at the pet store, so Mrs. Flores bought 15 bags of treats for her dog. Each bag had 6 treats in it. How many treats did she buy all together?
15 x 6 = 90
What are 3 multiples of 12?
eg. 24, 36, 48, 60, 72, 84, 96, 108, 120
2 x 40 =
___ x 10 = 90
5 x ___ = 35
80
9
7
45 ÷ 5 =
9 ÷ 3 =
90 ÷ 3 =
__ ÷ 9 = 10
9
3
30
90
Why is 2 a prime number even though it is even?
It only has 1 and itself as factors
Jack bought a game for $24 and a cap for $6. How many times more did the game cost than the cap?
4 times more
6 x 4 = 24
What are the factors of 24?
1, 24, 2, 13, 3, 8, 4, 6
I have a rectangle with an area of 30. What are the 4 possible designs for this rectangle? Draw and label them.
3 x 10
1 x 30
2 x 15
5 x 6
The numbers 6, 8, and 48 make a fact family! Write the four equations in this fact family.
6 x 8 = 48
8 x 6 = 48
48/ 6 = 8
48/ 8 = 6
Is 20 a prime or composite number? Prove it.
Composite. It has 3 factor pairs - 1,20,2,10,4,5
Katie bought a ticket to the baseball game that cost 3 times as much as her hotdog meal. Her meal cost $13. How much did the ticket cost?
3 x 13 = 39
What are the factors of 10?
What are 3 multiples of 10?
1, 2, 5, 10
eg. 20, 30, 40, 50, 60 etc
Fill in the ratio chart your teacher shows you
1 2 4 6 8
6 12 24 36 48
Use a model to show 45 ÷ 9 and find the answer
Check
45 ÷ 9 = 5
Name a composite number and show how you know it is composite.
Check
Kim and her sister were selling cookies. They made 12 cookies each. They decided to sell them in packs of 3. How many packs of cookies did they make?
8 packs.
(12 x 2) ÷ 3 = 8
What factors do 20 and 36 have in common?
1, 2 and 4
solve:
(3 x 5) X 8 =
120
Use division to solve the 2 missing numbers from the area model problems. Show how you used division.
120 ÷ 12 = 10
55 ÷ 5 = 11
It has an odd number of factors because it has a number multiplied by itself - 6 x 6.
Factors are
1, 36, 2, 18, 3, 12, 4, 9, 6
Jack raised $2 a lap for Apex and Jill raised $5. Their teacher said she would donate 2 times as much money as Jack and Jill raised. How much did the 3 of them raise all together if they did 10 laps?
What equation would you use to solve that?
((2 x 10) + (5 x 10)) x 2 = 140