LESSON 2

MATH MODULE 1

Skip count by 3s up to 36. (crossing the tens)

Skip count by 4s up to 48. (crossing the tens)

Write 83 ones - _____ tens _____ onesWrite 103 ones - _____ tens _____ onesWrite 163 ones – Write 263 ones – Write 875 ones -

Skip Counting & Taking Out the Tens

_16__ tens __3__ ones_26_ tens __3__ ones_87_ tens __5__ ones

10 hundreds = 1 thousand____ 10 tens = 1 ____10 ones = 1 ____10 tenths = 1 ____10 thousandths = 1 ____10 hundredths = 1 _____

Build Tens and Change the Units &

Multiply and Divide by 10

3

Multiply by 10. Cross out each disk and the number 3 to show that you’re changing its value. Then draw arrows to the tens column and write 3 tens disks and write 3 below the disk in the tens and a 0 in the ones.

3

3 0

Draw 3 ones disks and write the number 3 under the disks.

Multiply and Divide by 10

Multiply by 10. Cross out each disk and the number 5 to show that you’re changing its value. Then draw arrows to the ones column and write 5 ones disks and write 5 below the disk in the ones and a 0 in the tenths.

Draw 5 tenths disk and write the number 5 under the disk.

5

Show your work on your mat..8 x 1060 x 10.04 x 1040 / (divided by ) 102 / 10.3 / 10

Multiply and Divide by 10

A school district ordered 247 boxes of pencils. Each box contains 100 pencils. If the pencils are to be shared evenly amongst 10 classrooms how many pencils will each class receive? Draw a place value chart to show your thinking.

Application Problem

Share with a partner, small group or as a class what you remember from Lesson 1 about how adjacent units on the place value chart are related.

Moving one position to the left of the place value chart makes units 10 times larger. Conversely, moving one position to the right makes units 1 tenth the size

Concept Development - Review

.3 6 7

3 6 7 0

Concept Development – Problem 1-4

.3 6 7

3 6 7

Write 2 complete number sentences on your board

Explain in your Math notebook how you got your answer. What are similarities and differences between the two answers?

Digits are the same but their values have changed so their position in the number is different. The 3 is ten times larger in the product than in the factor. It was 3 hundreds, now it is 3 thousands. The 6 started out as 6 tens, but once it was divided by 10, it is now 1 tenth as large because it is 6 ones.

Concept Development Problems 1-4

.4 3 6 7

4 3 6 7 0

Concept Devolvement – Problem 1-4

.4 3 6 7

4 3 6 7

Write 2 complete number sentences on your board

Explain in your Math notebook how you got your answer. What are similarities and differences between the two answers?

Digits are the same but their values have changed so their position in the number is different. The 4 is ten times larger in the product than in the factor. It was 4 thousands, now it is 4 ten thousands. The 7 started out as 7 ones, but once it was divided by 10, it is now 1 tenth as large because it is 7 tenths.

Concept Development Problems 1-4

What patterns do you notice in the number of zeros in the product and the placement of the decimal in the quotient? What do you notice about the number of zeros in your factors and the shift in places in your product? What do you notice about the number of zeros in your divisor and shift in places in your quotient? (Have students discuss in a group or write their observation.)

Students Share

Concept Development Problems 1-4

Now solve in your math notebook (spiral) by visualizing your place value mat and recording only your products and quotients. You may check your work using a place value mat. 215.6 x 100215.6 ÷ 1003.7 x 1003.7 ÷ 100

Concept Development – Problems 5-8

Compare your work with your those at your table. Do you agree? How many times did the digit shift in each problem and why? Share your thinking with your table.

The digits shifted 2 places to the left when we multiply and shifted 2 places to the right when we divide. This time the numbers each shifted 2 places because there are 2 zeros in 100.

The values of the products are 100 times as large, so the digits had to shift to larger units.

The values of the quotient are 1 hundredth as large, so the digits had to shift to smaller units.

Concept Development – Problems 5-8

In your math writing journal explain how you would go about solving the following problems. Make sure to be very descriptive and to give the solution.0.482 x 1000482 ÷ 1000

Concept Development Problems 9-10

Are there any questions, comments, or suggestions from the class or for your classmates?

You will now work with a partner to complete the problem sets. You will be given 10 minutes to work on as many problems in the set as possible.

Debrief by checking some of the problem sets and/or having a discussion on some that did not get completed.

Complete the Exit Ticket. Please turn into the correct location.

Problem Set, Debrief, and Exit Ticket

Complete all problems.Reminders: Make sure to follow all directions

given and be very specific in your explanations when asked to explain.

Due on _________________

Homework