Base 10 Blocks

1. Base 10 Blocks Kris Smeester April 21, 2004

2. What are Base 10 Blocks? Base 10 blocks are a way to represent numbers with blocks. Remember, there are different size blocks that can represent numbers. You can use a unit, a long, or a flat. unit long flat

3. So, what do the blocks represent? Base 10 blocks show us how many units are included in each block. -A cube represents 1 unit. -A long is equal to 10 units. -A flat is equal to 100 units.

4. How can we use Base 10 Blocks? We can use Base 10 Blocks in adding and subtracting numbers. Using Base 10 Blocks can make addition and subtraction much easier to understand. Let’s look at some problems.

5. Sample Addition Problem We can use Base 10 Blocks for Addition: 25 +_____+_13_ 38

6. Sample Subtraction Problem We can also use Base 10 Blocks for subtraction: 25 -_ ____-_ 13__ 12

7. Trading Base 10 Blocks Remember that when we have too many units, we have to trade them for a long. = When we have 10 longs, we have to trade them for a flat. =

8. Sample Trading Problem 63 +________ 43 106 Remember, that when there are 10 longs, we must trade them for a flat. When subtracting, we can trade the flats in for longs, and the longs in for units. It is similar to carrying.

9. Overview Now that we have learned what Base 10 Blocks are, we can take the quiz. If you need more help with Base 10 Blocks, here are some helpful sites that you may find interesting: -Learning Base 10 Blocks- Learn how to trade Base 10 blocks for numbers. -Counting Base 10 Blocks-Group the blocks together to make longs or flats. -Base 10 Block Practice-Click on the link to get practice using Base 10 Blocks.