Multiplication
3 x 4
12
6 ÷ 2
3
Catherine, Jessie, and Sophie have 30 comic books. They want to share them equally. How many should each of them get?
They should each get 10 comic books.
7 x 3 = 21
What does the 7 represent?
Number of groups.
OR
Number in each group.
Explain the relationship between multiplication and division.
They are opposite. Multiplication is adding equal groups to determine the total. Division is splitting up the total into equal groups.
4 x 5
20
20 ÷ 10
2
Gabriel and Liam have $18. If they share the money equally, how much does each of them have?
They each have $9.
6 + 6 + 6 + 6 = 24
Write the multiplication sentence instead.
6 x 4 = 24
42 ÷ 5 = ?
How do you know this won't work?
5 x 8
40
45 ÷ 9
5
Dylan S has 30 dog toys at his house. He wants to sort them equally into 5 bins. How many dog toys will go into each bin?
5 ÷ 20 = 4
What is wrong about this division sentence?
The 20 should be before the division symbol, to show that 20 is being divided by 5.
20 ÷ 5 = 4
When would you use multiplication in real life?
- Buying packages of something.
- Determining the total of many groups
- Adding money (ex. I have 7 $5 bills)
9 x 7
63
35 ÷ 5
7
Eveline has practiced dance for 40 hours. She practices for the same amount of time every day, and she's practiced for 8 days. How many hours did she practice each day?
She practiced for 5 hours each day.
How is multiplication helpful?
It's faster and more efficient than adding the same number over and over.
When would you use division in real life?
- Sharing something equally
- Figuring out how much of something per day
10 x 11
110
56 ÷ 7
8
Our class has 64 stickers to place on 8 posters. If each poster must have the same number of stickers, how many stickers should go on each poster?
8 stickers will go on each poster.
2 ÷ 5 = 10
What is wrong with this sentence?
There is a division symbol instead of a multiplication symbol.
2 x 5 = 10
What is 2 x 4 x 9?
2 x 4 x 9 = 72
- 2 x 4 = 8
- 8 x 9 = 72