MAFS3OA37 Lesson Opening Solve the two problems below Write the equation you used to solve the problem Jason ate 2 bags of candies Each bag contained 9 candies How many candies did Jason eat ID: 512101
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Slide1
Multiplying with 3
MAFS.3.OA.3.7Slide2
Lesson Opening
Solve the two problems below. Write the equation you used to solve the problem.
Jason ate 2 bags of candies. Each bag contained 9 candies. How many candies did Jason eat?
Liza has 10 photos that she wants to put onto 2 pages in a photo album. If she put the same number of photos on each page, how many photos will be on each page?Slide3
Lesson Opening
Solve the two problems below. Write the equation you used to solve the problem.
Jason ate 2 bags of candies. Each bag contained 9 candies. How many candies did Jason eat?
Liza has 10 photos that she wants to put onto 2 pages in a photo album. If she put the same number of photos on each page, how many photos will be on each page?
2 bags (groups) of 9 candies
2 x 9 = 18
Jason ate 18 candies.
10 photos on 2 pages (groups)
10 ÷ 2 = 5 OR 2 x ___ = 10
There are 5 photos on each page.Slide4
Multiplying with 3
Multiplying by 3 is the same as
tripling
a number.
You can think of this as
doubling a number, then adding another set.Slide5
Multiplying with 3
Multiplying by 3 is the same as
tripling
a number.
You can think of this as
doubling a number, then adding another set.If I have a set of 4 utensils, how many utensils would I have if I had 3 sets?Slide6
Multiplying with 3
Multiplying by 3 is the same as
tripling
a number.
You can think of this as
doubling a number, then adding another set.If I have a set of 4 utensils, how many utensils would I have if I had 3 sets?
First, double the number in a set.
4 × 2 = 8Slide7
Multiplying with 3
Multiplying by 3 is the same as
tripling
a number.
You can think of this as
doubling a number, then adding another set.If I have a set of 4 utensils, how many utensils would I have if I had 3 sets?
First, double the number in a set.
4 × 2 = 8
Then add the number in another set.
8 + 4 = 12
+Slide8
Multiplying with 3
Multiplying by 3 is the same as
tripling
a number.
You can think of this as
doubling a number, then adding another set.If I have a set of 4 utensils, how many utensils would I have if I had 3 sets?
First, double the number in a set.
4 × 2 = 8
Then add the number in another set.
8 + 4 = 12
+
So, 3 groups of 4
or
3 × 4
is 12.
3 × 4 = 12Slide9
Multiplying with 3
Multiplying by 3 is the same as
tripling
a number.
You can think of this as
doubling a number, then adding another set.You can also skip count by 3s.Slide10
Multiplying with 3
Multiplying by 3 is the same as
tripling
a number.
You can think of this as
doubling a number, then adding another set.You can also skip count by 3s.If I have 4 sets of 3 strainers, how many strainers do I have?Slide11
Multiplying with 3
Multiplying by 3 is the same as
tripling
a number.
You can think of this as
doubling a number, then adding another set.You can also skip count by 3s.If I have 4 sets of 3 strainers, how many strainers do I have?
3,
6,
9,
12Slide12
Multiplying with 3
Multiplying by 3 is the same as
tripling
a number.
You can think of this as
doubling a number, then adding another set.You can also skip count by 3s.If I have 4 sets of 3 strainers, how many strainers do I have?
3,
6,
9,
12
So, 4 groups of 3
or
4 × 3
is 12.
4 × 3 = 12Slide13
Multiplying with 3
Let’s practice
doubling, then adding another set
3 groups of 5: ______________________________
3 groups of 2: ______________________________
3 groups of 6: ______________________________First, double 5
5 × 2 = 105 + 5 = 10
Then add another 5
10 + 5 = 15
So, 3 groups of 5, or 3 × 5 = 15
First, double 2
2 × 2 = 4
2 + 2 = 4
Then add another 2
4 + 2 = 6
So, 3 groups of 2, or 3 × 2 = 6
First, double 6
6 × 2 = 12
6 + 6 = 12
Then add another 6
12 + 6 = 18
So, 3 groups of 6, or 3 × 6 = 18Slide14
Multiplying with
3
Let’s look at our Multiplication Table…Slide15
Multiplying with
3
Find all the multiples of 3…Slide16
Multiplying with
3
Find all the multiples of 3…
The multiples have a pattern of even, odd, even, odd…Slide17
Multiplying with
3
Let’s look at our 100 Chart…Slide18
Multiplying with
3
Find all the multiples of 3.Slide19
Multiplying with
3
Find all the multiples of 3.
The multiples have a pattern of even, odd, even, odd…
A diagonal pattern is made.
Most of the rows have 3 highlighted multiples.
There are usually only 3 multiples in each new tens place.
There are 2 spaces between each highlighted place in the rows and columns.Slide20
Game: All Lined Up
What you need:
Game board
Spinner, 10-sided die, OR digit cards
How to play:
The shorter player starts.Spin, roll, or draw a digit card and multiply that number by 3.Place your product in one of the six empty boxes on your game board. The numbers must be placed in the correct number sequence. (If a player has a 3, 9, and 15 in the first three boxes, and spins a 4 to get a product of 12 on her next turn, she cannot play the 12 and loses her turn.)The first player to fill all six boxes wins.Slide21
Closing
What is one strategy you used for multiplying with 3?
Skip count by 3
Double the other factor, then add the other factor
Draw it/model itSlide22
Exit Ticket
Hoover has 7 shelves with 3 hats on each shelf. How many hats does Hoover have?
Model the problem.
Write an equation that corresponds to it.
Write another equation that corresponds to it.
Write the answer to the problem in a complete sentence.