multiplying 2-digit by 2-digit numbers
DESCRIPTION
4th Grade Math. Multiplying 2-digit by 2-digit Numbers. Using the Area Model / Box Method. Slide 1. Here's the Problem. Let's go with 23 x 45. Slide 3. Expanded Form. 23 becomes 20 + 3 45 becomes 40 + 5. page 4. Drawing Time!. Draw a window with 4 panels. 20 and 3 go on the top - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/1.jpg)
4th Grade Math
Multiplying 2-digit by 2-digit Numbers
Using the Area Model / Box Method
![Page 2: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/2.jpg)
Slide 1
Here's the Problem
Let's go with 23 x 45
![Page 3: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/3.jpg)
Slide 3
Expanded Form
23 becomes 20 + 345 becomes 40 + 5
![Page 4: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/4.jpg)
page 4
Drawing Time!Draw a window with 4 panels.20 and 3 go on the top40 and 5 go on the side
![Page 5: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/5.jpg)
Okay, Let's Multiply!
❖ The top left square...
❖ Is under the 20...
❖ And beside the 40...
❖ So multiply 20 x 40
❖ 800 in the 1st square
![Page 6: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/6.jpg)
Square 2
❖ The top right square...
❖ Is under the 3...
❖ And beside the 40
❖ Multiply 3 x 40
❖ 120
![Page 7: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/7.jpg)
Down on the Corner
❖ Bottom left square...
❖ Under the 20...
❖ Beside the 5
❖ 5 x 20
❖ 100
![Page 8: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/8.jpg)
The Last Panel
❖ The bottom right square...
❖ Is under the 3...
❖ And beside the 5
❖ 3 x 5
❖ 15
![Page 9: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/9.jpg)
How much are those numbers in the Window?
❖ These 4 numbers are the partial products
❖ Add them together to get the final answer
❖ Thanks to the commutative property the order that you add them doesn't matter
❖ In this example, we are adding across first, then adding our two answers
![Page 10: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/10.jpg)
Add it up!
❖ Adding the top row
❖ 800 + 120
❖ 920
![Page 11: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/11.jpg)
Bottoms Up!
❖ Adding the bottom Row
❖ 100 + 15
❖ 115
![Page 12: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/12.jpg)
Summing it Up
❖ Add the two sums together
❖ 920 + 115
❖ 1,035
![Page 13: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/13.jpg)
Almost the last page
This is it! 23 x 45 = 1,035
![Page 14: Multiplying 2-digit by 2-digit Numbers](https://reader038.vdocuments.net/reader038/viewer/2022102800/56812bc6550346895d901051/html5/thumbnails/14.jpg)
This is the last page
I hope this helpsThe end(Told you it was the last page)