Problem for Today

Find the value of the following expression:8,230,845,132 + 107

Decimal Place Value

Content Objective: Students use a place value chart to help them read numbers to the thousandths place.

Content Objective: Students use a place value chart to help them read numbers to the thousandths place.

Vocabulary Check:

DECIMALA decimal is a number that uses a decimal point and has one or more digits to the right of the decimal point.

Example: 63.231 OR Sixty three and two hundred thirty one thousandths

Table Talk:One gallon equals 3.785 liters. How do you read this number? Use your place value chart.

Content Objective: Students use a place value chart to help them read numbers to the thousandths place.

Table Talk:One gallon equals 3.785 liters. How do you read this number? Use your place value chart.

Reading numbers with decimals:

To read a number with a decimal. Read the whole numbers first. Next, “and” for the decimal. Last, use the last number to the right of the decimal to determine the place value to use.

Content Objective: Students use a place value chart to help them read numbers to the thousandths place.

Partner practice:Say the following numbers to your elbow partner:• 212.92• 51.637• 3,111.845• 23,125.3• 10,000.9456

Reading numbers with decimals: To read a number with a decimal. Read the whole numbers first. Next, “and” for the decimal. Last, use the last number to the right of the decimal to determine the place value to use.

Content Objective: Students use a place value chart to help them read numbers to the thousandths place.

Quick Question: Are the numbers to the right of the decimal greater than or less than 1? Talk to your across the table partner.

Important to remember: Ones can be broken down into parts smaller than one whole!

Note:The ones place is also called the “oneths” place or “first” place.

“One” and “Oneth” are synonyms.

Content Objective: Students use a place value chart to help them read numbers to the thousandths place.

Write in Short Word Form:9.73

Use the standard form to show the number and word form to show the place:

9 and 73 hundredths

Table Talk:Use your place value chart:

How would you say the number, 6.54? How would you write the number in short word form?

Content Objective: Students use a place value chart to

help them read numbers to the thousandths place.

Standard form: 72.891Short word form: 72 and 891 thousandthsWord form: seventy-two and eight hundred ninety-one thousandthsExpanded form: (5x10)+ (2x1)+ (8 x 0.1)+ (9 x 0.01)+ (1 x 0.001)

If the first digit to the right of the decimal in 72.891 was changed to a “0” how would you write the new number in different forms?

Different ways to write decimals

Content Objective: Students use a place value chart to help them read numbers to the thousandths place.

You will need a piece of lined paper for the rest of the lesson! Turn in at the end of the lesson for a teacher check and grade.

What is the purpose of the decimal point in a decimal number?

The decimal separates the whole number part of the number from the less than one or decimal part of the number.

Explain it!

Guided PracticeDo you know HOW? On notecard, write the place and value of underlined digit.

1.) 19.4522.) 990.2333.) 2.98424.) 3,481.1089

Write the number in the form requested.

5.) 5.678 in word form6.) 72.123 in short word form7.) 325.325 in expanded form

Content Objective: Students use a place value chart to help them read numbers to the thousandths place.

Guided Practice

Communicate your ideas

8.) In the number, 2.9842, how do you know that 0.0002 is the value of the digit 2?

9.) How do you use a decimal to read and write very small numbers?

Be Precise

• What is the decimal portion of 19.452? What is the whole number portion of 19.452?

Content Objective: Students use a place value chart to help them read numbers to the thousandths place.

Reflect, Practice, Preview

Homework, due Tuesday 10/9Practice decimal place value worksheet.

Preview for tomorrow:Preview of concept for tomorrow. Compare and order decimalsComplete the 4 questions and turn in.

Reflect on Content Objective:

Students use a place value chart to help them read numbers to the thousandths place. Any other ideas you learned?

Station Activities

1. Exponents and Place Value – Display the Digits 2. Compare & Order Whole Numbers –

Teamwork Center3. Place Value – Toss and Talk Bingo4. Multiply & Divide by 10, 100, 1000 – Teacher

Time5. Multiply & Divide – Display the Digits6. Study Station – start or complete homework

• I will practice math knowledge I have been learning.

• I will follow directions and use tools appropriately.