Math Clip Art--Base Ten Blocks--30

Topic

Number Models

Description

This image is a key component of the base ten blocks series, demonstrating the modeling of the number 25. It employs a template in the form of a placemat where base ten blocks representing tens and ones are strategically placed. This visual representation provides a concrete model of the number 25 using the base ten system, further reinforcing the concepts of place value and number composition.

The importance of math clip art, especially base ten block models, in mathematics education cannot be overstated. These visual aids transform abstract numerical concepts into tangible, easily understandable representations. They play a crucial role in helping students grasp fundamental ideas about place value, number composition, and the structure of our decimal system. By incorporating these images into lessons on Numbers, teachers can create a more engaging and accessible learning environment, fostering a deeper understanding of numerical concepts and relationships.

Teacher's Script: "Now, let's explore how we represent the number 25 using our base ten blocks. We have two long blocks for the tens, and five small cubes for the ones. This is a special number because it's a quarter of a hundred. How does this compare to 24? What do you think will happen when we add one more? How will our representation change when we get to 30?"

For a complete collection of math clip art related to Number Models click on this link: Number Models: Base Ten Blocks Collection.

The Base 10 Number System

When you first learned to count, you started at zero or one and counted to nine.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9

After nine, the numbers started repeating.

10, 11, 12, 13, 14, 15, 16, 17, 18, 19

After 19, the pattern of numbers continues. In fact, counting numbers involves just using the digits from 0 to 9 in different combinations.

Why is that?

Our numbering system is called a base 10 system. This means there are ten digits, which you know as 0 to 9. All numbers in a base 10 system just use these digits.

Counting in a Base 10 System

When you look at a number, each digit represents a certain place value. Take a look at this three-digit number

The digit 3 is in the ones place. The digit 2 is in the tens place. The digit 1 is in the hundreds place.

The digit 3 is in the ones place. The digit 2 is in the tens place. The digit 1 is in the hundreds place.

For whole numbers, place value increases 10-fold.

Place Value in the Base 10 System

Place value determines the size of a number. Take a look at this number:

23

In the ones place is the digit 3, but int he tens place is the digit 2. Don't let the single digit fool you. The 2 in the tens place has a value of 20.

Now look at this number:

542

In the ones place is the digit 2. In the tens place is the digit 4. In the hundreds place is 5. If we were to separate these numbers, we would see this:

500

40

2

So, in going from left to right starting at the decimal point, each place value is ten times the value of the place value to the right.

If you're given a description of a number using just place value information, you can write a number. Here's an example. 

The digit in the ones place is 5. The digit in the tens place is 3. The digit in the hundreds place is 9. What is the number?

Using this description we write the following number: 935.

Number Systems with Other Bases

You've seen how the base 10 number system works, but why do we use a base 10 system? Are there other number systems?

Let's address the first question. The reason we use a base 10 system is probably because we have ten fingers to count with. Do you think it's a coincidence that our base 10 numbering system aligns with our 10 fingers to count?

But we have 10 fingers and 10 toes. Are there number systems that use base 20. Yes!

The Mayan culture used a base 20 system for counting. These are twenty symbols used to count.

This numbering system uses just three symbols in different combinations: dots, dashes, and the shell. The shell represents zero. The dash represents an increment of five. The dot represents a value of one. Different combinations of these symbols can model any number.

Another, even more popular system is the binary system, which is used extensively with computers. With the binary system, there are only two digits: 0 and 1. This combination of digits can be used any number  equivalent to our base 10 numbers. Here are the first 10 numbers in binary and base 10.

Why do computers use a binary, or base 2, system? What is the advantage of a binary system?

Computer circuitry and connections involve a lot of on-off switching. Many computer commands are basically combinations of these on-off switches. A binary system is ideal for modeling an on-off system. If you let 0 mean off and 1 mean on, then a binary code can be used to model not only numbers but any computer state.

Each number system has its own rules for writing numbers. Once you learn the rules, then you can write any number in any number system.

Number Models: Base Ten Blocks

One way to model base ten numbers is to use number models, and one of the best ones to use is to use base ten blocks. Base ten blocks are a visual model to represent numbers. Here is what these models look like.

For each of these models, place the correct number of blocks to model the digit in that place value.

This is a model for the number 24. There are two tens blocks in the tens place and four ones blocks in the ones place.

Here is a number to the hundreds place.

To model 250, put two hundreds blocks in the hundreds place, five tens blocks in the tens place, and no blocks in the ones place.