Transcript Multiplication Take 1

Multiplication
Take 1
By Miss O.
Meanings for Multiplication
• Solve to review:
3+3=
What do you notice about solving
these?
Talk and turn to your partner
about what you notice.
Then share your findings with the
group.
4+4+4=
2+2+2+2+2=
How can multiplication be used when
equal groups are combined?
• Multiplication can be used to find the total
when you know the number of equal groups
and the number in each group.
For example: Here we
have 3 groups.
In each group, we have
2 stars.
We could say 3 groups
x 2 stars (in each
group) = 6 total stars.
Let’s Think Through Some Examples!
• Joy is baking muffins. She has 4 rows with 3
muffins in each row. How many muffins does
Draw this in
she have in all?
your notes!
Row 1
Row 2
Row 3
Row 4
1
2
3
Array
• The muffin pan is like an array.
• Objects arranged in equal rows form an array.
• You can multiply to find the total number
because the rows are equal.
• 4 x 3 = 12
Changing Arrays
Here’s a different muffin pan
as an array.
What if Joy used this pan?
How many rows? ______
How many in each row? ____
We could say 6 x 4 = ______
6 x 4 = 24
factor
factor
Product is the answer to
a multiplication
problem!!
product
Last Example Together!
• Joy put the muffins on 3 plates with 8 muffins
on each plate. How many muffins does she
have in all?
• How many plates (groups)? _______
• How many on a plate? ________
*Fill in the blanks with a partner.
• _____ x _____ = _____
Then talk about it with your group.
Here’s What I Want You To Do:
• Write an addition sentence and a
multiplication sentence for each picture.
Example
Questions?
Ask Sreepal!
5 + 5 = 10
5 x 2 = 10
On Your Own (in your math notebook)
1.
2.
3.
4.
4 Ways to show you are multiplying:
1. 5 x 3 = 15
2. 5 3 = 15
3. 5(3) = 15
4. (5)3 = 15
Check Out the Array!
• Miss O. brought in her muffin pan.
• Pass it around and talk about how it is an
array.
• What’s the
multiplication
problem we can
form out of it?
_____ x _____ = _____
 Write it in your math notebook.
What does this array tell you?
7 rows
7 x 4 = ______
4 in each row
Multiple
• The product (answer of a multiplication
problem) of any two whole numbers.
4 x 4 = 16
16 is a MUTLIPLE of 4
What are the multiples of 2?
2 x 1 = _____
2 x 2 = _____
2 x 3 = _____
2 x 4 = _____
2 x 5 = _____
2 x 6 = _____
2 x 7 = _____
2 x 8 = _____
2 x 9 = _____
2 x 10 = _____
2 x 11 = _____
2 x 12 = _____
Hint: Have these
memorized by Monday!
What are the multiples of 3?
3 x 1 = _____
3 x 2 = _____
3 x 3 = _____
3 x 4 = _____
3 x 5 = _____
3 x 6 = _____
3 x 7 = _____
3 x 8 = _____
3 x 9 = _____
3 x 10 = _____
3 x 11 = _____
3 x 12 = _____
Hint: Have these
memorized by Monday!
What are the multiples of 4?
4 x 1 = _____
4 x 2 = _____
4 x 3 = _____
4 x 4 = _____
4 x 5 = _____
4 x 6 = _____
4 x 7 = _____
4 x 8 = _____
4 x 9 = _____
4 x 10 = _____
4 x 11 = _____
4 x 12 = _____
Hint: Have these
memorized by Monday!