Download presentation

Presentation is loading. Please wait.

Published byFelix Byrd Modified over 4 years ago

1
4th Grade Math Multiplying 2-digit by 2-digit Numbers Using the Area Model / Box Method

2
Slide 1 Here's the Problem Let's go with 23 x 45

3
Slide 3 Expanded Form 23 becomes 20 + 3 45 becomes 40 + 5

4
page 4 Drawing Time! Draw a window with 4 panels. 20 and 3 go on the top 40 and 5 go on the side

5
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

6
Square 2 ❖ The top right square... ❖ Is under the 3... ❖ And beside the 40 ❖ Multiply 3 x 40 ❖ 120

7
Down on the Corner ❖ Bottom left square... ❖ Under the 20... ❖ Beside the 5 ❖ 5 x 20 ❖ 100

8
The Last Panel ❖ The bottom right square... ❖ Is under the 3... ❖ And beside the 5 ❖ 3 x 5 ❖ 15

9
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

10
Add it up! ❖ Adding the top row ❖ 800 + 120 ❖ 920

11
Bottoms Up! ❖ Adding the bottom Row ❖ 100 + 15 ❖ 115

12
Summing it Up ❖ Add the two sums together ❖ 920 + 115 ❖ 1,035

13
Almost the last page This is it! 23 x 45 = 1,035

14
This is the last page I hope this helps The end (Told you it was the last page)

Similar presentations

© 2020 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google