Putting Together & Taking Apart Whole Numbers: Lesson for Kids

Instructor: Mark Boster
It is important to know how to put together numbers and take them apart. You may be asked to do this at different times in school, on tests, or in math class. So, here you go!

Building Blocks

Have you ever used those little snap-together plastic blocks to build a house? It may take fifteen blocks and two windows to make a house. Or maybe you have a house already built, and you take it apart into some blocks, some windows, and a door? Well, that is what happens when you build or take apart numbers too.

Small to Big

Let's figure out how to build number houses out of little numbers. Here's a common math problem that you may know. Let's use some blocks. Well, you can use 2 blocks + 2 blocks to create 4 blocks. Since 2 + 2 = 4.

How about 2 + 2 + 2 + 2? That would be 8.. If you use 2 four times, you get 8. You might have also noticed this is the same as 2 x 4 = 8.

Let's choose another number. Let's pick the number 7. What can you make with more than one seven? Well, if you use two sevens, ( 7 x 2 ) that is 14. It is the same as 7 + 7 = 14.

What about groups of seven blocks for the roof? 7 + 7 + 7 + 7 + 7? Wow, that would get you up to 35. You just have to use a lot of sevens to get there. How could that be written in a multiplication question? The answer is 7 x 5.

7 + 7 + 7 + 7 + 7=35

Big to Small

What if you found a block house and took it apart into smaller pieces? Maybe your house started with one hundred blocks.

Now, Look at the 5 x 5 x 4 = 100 diagram.

You know, if we broke the house into 5 sections with 20 blocks in each section, that is still 100 blocks. (100 = 20 x 5)

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