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# Topic D a dding and subtracting decimals - PowerPoint PPT Presentation

Topic D a dding and subtracting decimals. STANDARD - 5.NBT.2, 5.NBT.3, 5.NBT.7. Grade 5 Module 1 Lesson 9. Objective: A dd decimals using place value  strategies and relate those strategies  to a written method. MATERIALS NEEDED FOR THIS LESSON. Student. P ersonal White Boards

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Topic D a dding and subtracting decimals

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Topic D

STANDARD - 5.NBT.2, 5.NBT.3, 5.NBT.7

Module 1 Lesson 9

Objective:

Add decimals using place value  strategies and relate those strategies  to a written method.

MATERIALS NEEDED

FOR THIS LESSON

Student

Personal White Boards

place value disks

Student Pages

Sprint A & B

Problem Set

Exit Ticket

Homework

Teacher

Teacher Pages

Fluency Practice(14 minutes)

Round to the Nearest One

8 minutes

5.NBT.4

SPRINT A

1 minutes

Do as many problems as you can.

Get set!

THINK!

Round to the Nearest One

5.NBT.4

SPRINT B

1 minutes

Do as many problems as you can.

Get set!

THINK!

Decompose the Unit

2 minutes

5.NBT.1

6.358

Say the number

How many tenths?

_____ tenths _____ hundredths

7.354

Say the number

How many tenths?

_____ tenths _____ hundredths

Round to Different Place Vlaues

2 minutes

5.NBT.4

2.475

Say the number?

Round to the nearest tenth

Round to the nearest hundredth

2.987

Say the number?

Round to the nearest tenth

Round to the nearest hundredth

One Unit More

2 minutes

5.NBT.7

Say the decimal that's one tenth more ..

5 tenths

5 hundredths

5 thousandths

Say the decimal that's one tenth more ..

8 hundredths

3 tenths

2 thousandths

What is one more thousandth

0.052

What is one more tenth more than

35 hundredths

What is 1 thousandth more than

35 hundredths

What is one hundredths more than

438 thousandths

Application Problem

(5 minutes)

Ten baseballs weigh 1,417.4 grams. About how  much does 1 baseball weigh? Round your  answer to the nearest tenth of a gram. Round to  the nearest gram. If someone asked you, "About  how much does a baseball weigh?" which anser  would you give? Why?

Concept Development (31 minutes)

Problem 1

2 tenths + 6 tenths

ones

tenths

thousandths

hundredths

Problem 2

2 ones 3 thousandths + 6 ones 1 thousandths

ones

tenths

thousandths

hundredths

Problem 3

2 tenths 5 thousandths + 6 hundredths

ones

tenths

thousandths

hundredths

Problem 4

1.8 + 3 tenths

ones

tenths

thousandths

hundredths

Problem 5

1 hundred 8 hundredths + 2 ones 4 hundredths

hundreds

ones

tens

tenths

thousandths

hundredths

Problem 6

148 thousandths + 7 ones 13 thousandths

hundreds

ones

tens

tenths

thousandths

hundredths

Problem 7

0.74 + 0.59

hundreds

ones

tens

tenths

thousandths

hundredths

Problem 8

7.048 + 5.196

hundreds

ones

tens

tenths

thousandths

hundredths

Problem 9

7.44 + 0.774

hundreds

ones

tens

tenths

thousandths

hundredths

Problem Set (10 minutes)

(Complete independently!)

Student Debrief (10 minutes)

How is adding decimal fractions the same as  adding whole numbers? How is it different

Did you recognize a pattern in the digits used  in #2? Look at each row and column.

What are some different words you have used through  the grades for changing 10 smaller units for 1 of the  next larger units or changing 1 unit for 10 of the next  smaller units?

What do you notice about the sum in #2f? What  are some different ways to express the sum?

What do you notice about the addends in letters b,d  and f in #1? Explain the thought process in solving  these problems.

EXIT TICKET (3 minutes)

Complete the exit ticket and turn in...

HOMEWORK