multiplication take 1
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Multiplication Take 1. By Miss O. Meanings for Multiplication. Solve to review: 3 + 3 = 4 + 4 + 4 = 2 + 2 + 2 + 2 + 2 =. What do you notice about solving these? Talk and turn to your partner about what you notice. Then share your findings with the group. - PowerPoint PPT PresentationTRANSCRIPT
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Multiplication Take 1
By Miss O.
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Meanings for Multiplication
• Solve to review:
3 + 3 =
4 + 4 + 4 =
2 + 2 + 2 + 2 + 2 =
What do you notice about solving these?
Talk and turn to your partner about what you notice.
Then share your findings with the group.
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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.
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Let’s Think Through Some Examples!
• Joy is baking muffins. She has 4 rows with 3 muffins in each row. How many muffins does she have in all?
Row 1
Row 2
Row 3
Row 4
1 2 3
Draw this in your notes!
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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
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Changing ArraysHere’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 = ______
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6 x 4 = 24
factor factorproduct
Product is the answer to a multiplication problem!!
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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? ________• _____ x _____ = _____ *Fill in the blanks with a partner.
Then talk about it with your group.
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Here’s What I Want You To Do:• Write an addition sentence and a
multiplication sentence for each picture.
Example
5 + 5 = 105 x 2 = 10
Questions?
Ask Sreepal!
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On Your Own (in your math notebook)1. 2.
3.
4.
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4 Ways to show you are multiplying:
1. 5 x 3 = 15
2. 5 3 = 15
3. 5(3) = 15
4. (5)3 = 15
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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 multiplicationproblem we canform out of it?_____ x _____ = _____ Write it in your math notebook.
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What does this array tell you?
7 rows
4 in each row
7 x 4 = ______
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Multiple
• The product (answer of a multiplication problem) of any two whole numbers.
4 x 4 = 16
16 is a MUTLIPLE of 4
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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!
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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!
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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!