Reflection: Developing a Conceptual Understanding Using Money to Understand Decimal Place Value  Section 3: Group Activity/Exploration
This activity allows a lot of movement and interaction within the classroom. This is a perfect activity to use for MP3. The students get a chance to challenge each others answers. This allows for critiquing the reasong of others.
I find that students enjoy activities that allow them to move around and talk. With this activity, the students justify their reasoning with their classmates. It is very important for the students to hear the thought process of each other. Also, with the lesson, by using money to help understand decimals, the students get a conceptual understanding of what each place value means. The students learned that the tenths place is represented by a dime because it takes 10 dimes to make a dollar. Also, the students learned that a penny represents that hundredths place because it takes 100 pennies to make a dollar.
Using Money to Understand Decimal Place Value
Lesson 1 of 8
Objective: Students will be able to use placevalue charts to read and write decimals in tenths and hundredths by using money.
Direct Instruction
The students have already learned place value for whole numbers. In today's lesson, they will learn to use money to help understand decimal place value.
I tell the students, "You know how to identify place value for whole numbers. Today, you will use money to identify place value for parts of a whole. What exactly is $8.23? Let's find out."
I bring the class to the carpet for a whole class discussion on using money to understand decimals. The Using Money to understand decimals.pptx powerpoint is on the Smart board.
Discussion:
I begin the lesson by reviewing the vocabulary:
Tenths – One of ten equal parts of a whole.
Hundredths – One part of 100 equal parts of a whole.
Decimal Point – A dot used to separate a dollar from cents or ones from tenths in a number.
I let the students know that we can use money to help us understand decimals. A dime can help you understand the tenths place. It takes 10 dimes to make a dollar.
A penny can help you understand the hundredths place. It takes 100 pennies to make a dollar.
To practice using money to help with decimals, we practice by using the following information in the table:
Dollars (ones)

.

Dimes (Tenths)

Pennies (Hundredths)

8

.

2 
3 








There is a 3 in the hundredths place. The hundredths place is like having pennies. If you have 3 pennies, how much money do you have? I call on a student for a response. There is a 2 in the tenths place. The tenths place is like having dimes. If you have 2 dimes, how much money do you have?
Which place is greater, the tenths or the hundredths? Explain.
I find that it is very important to question students in the whole class discussion. This allows me to check for understanding as I teach.
After determining how to use money to help understand place value, I show the students how to write numbers.
I let the students know that we can write this number in 3 other ways:
To give students more practice, I tell them that we will practice together. Help me write this number in three other ways.
Dollars (ones)

.

Dimes (Tenths)

Pennies (Hundredths)

7

.

6 
2









After the whole class discussion, the students go back to their seats for instruction about the group activity.
Resources (2)
Group Activity/Exploration
Activity: Are we Equal?
Students will have 3 different numbers written in either word form, standard form, or expanded form. The purpose of the activity is to have students be able to recognize their number in any form. They will have to find other students with their numbers written in a different form. For example, the number $5.48 will be written as 1) 5 dollars + 4 dimes + 8 pennies, 2) 5 ones, 4 tenths, & 8 hundredths, and 3) five dollars and fortyeight cents. When the student finds someone with their number, they must each write down the number (in its form), and then record it correctly in the place value chart. If one student disagrees with the other student, then the they must use Accountable Talk to justify why they think they have the correct number. If the other student can counter their example, then the students must see the teacher to solve the disagreement. The teacher will not tell the students the correct answer, but will lead the students to the answer by questioning the students to get them to understand for themselves.
When the students find all 3 forms of their numbers, they must write a paragraph explaining how they know they have found the correct numbers. Also they must explain the difference between the tenths and hundredths place (what money can help them with these places.)
Any students who complete the activity early, may go to the computers to practice the skill at the following site:
http://www.kidsmathgamesonline.com/numbers/decimals.html
Resources (1)
Resources (1)
I give each student an independent activity sheet. First, the students put numbers on a place value chart. This shows me if the students understand decimal place value. In today's lesson, the students learned to write the numbers in 3 different ways. On the independent activity, the students must do this to show mastery of the skill. Also, the students must explain how the place value chart and money help with their solving of the problem.
This independent activity is very important because it gives me the opportunity to see if the students actually mastered the skill. Group work excellent to build a classroom community, and hear how other's think. However, I feel that independent work is essential to allow the teacher to assess whether all students mastered the skill.
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Resources
Thank you for your comments. I am glad that this lesson helped your students!
 6 months ago  Reply
I used this lesson as an Intervention for students who didn't get it in the Core lesson. There were a lot of aha moments. This really gave decimals a meaning that they could understand and relate to. Thanks. I love this website.
 2 years ago  ReplyThis is an excellent introduction. This will definitely allow my students to grasp the concept using real world techniques. You rock!
 2 years ago  ReplySimilar Lessons
Environment: Suburban
Environment: Suburban
Adding Fractions by Thinking about Decimals
Environment: Urban
 UNIT 1: Fractions
 UNIT 2: Skills Review
 UNIT 3: Algebra
 UNIT 4: Geometry
 UNIT 5: Patterns & Expressions
 UNIT 6: ProblemSolving Strategies
 UNIT 7: Decimals
 UNIT 8: Measurement and Data
 UNIT 9: Multiplication and Division Meanings
 UNIT 10: Place Value
 UNIT 11: Adding and Subtracting Whole Numbers
 UNIT 12: Multiplying and Dividing
 LESSON 1: Using Money to Understand Decimal Place Value
 LESSON 2: Comparing and Ordering Decimals using Money
 LESSON 3: Fractions and Decimals
 LESSON 4: Comparing and Ordering Fractions and Decimals Task
 LESSON 5: Fractions and Decimals on a Number Line
 LESSON 6: Adding and Subtracting Decimals
 LESSON 7: Multiply a Whole Number by a Decimal
 LESSON 8: Dividing a Decimal by a Whole Number