Topic Dadding and subtracting decimals

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

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

Grade 5Module 1 Lesson 9

MATERIALS NEEDEDFOR THIS LESSON

Personal White Boardsplace value disks

Teacher

Student

Teacher Pages

Student Pages

Sprint A & BProblem SetExit TicketHomework

Fluency Practice (14 minutes)

1 minutesDo as many problems as you can.

Do your personal best. Take your mark!

Get set! THINK!

Round to the Nearest One

SPRINT A

5.NBT.4 8 minutes

1 minutesDo as many problems as you can.

Do your personal best. Take your mark!

Get set! THINK!

Round to the Nearest One

SPRINT B

5.NBT.4

Decompose the Unit

5.NBT.1 2 minutes

6.358

Say the numberHow many tenths?_____ tenths _____ hundredths

7.354

Say the numberHow many tenths?_____ tenths _____ hundredths

Round to Different Place Vlaues

5.NBT.4 2 minutes

2.475 Say the number?Round to the nearest tenthRound to the nearest hundredth

2.987Say the number?Round to the nearest tenthRound to the nearest hundredth

One Unit More

5.NBT.7 2 minutes

5 tenths 5 hundredths5 thousandths

Say the decimal that's one tenth more ..

8 hundredths 3 tenths2 thousandths

Say the decimal that's one tenth more ..

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

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?

(5 minutes)

Concept Development (31 minutes)

Problem 1

adding decimals

2 tenths + 6 tenths

ones tenths hundredths thousandths

Problem 2

adding decimals

2 ones 3 thousandths + 6 ones 1 thousandths

ones tenths hundredths thousandths

Problem 3

adding decimals

2 tenths 5 thousandths + 6 hundredths

ones tenths hundredths thousandths

Problem 4

adding decimals

1.8 + 3 tenths

ones tenths hundredths thousandths

Problem 5

adding decimals

1 hundred 8 hundredths + 2 ones 4 hundredths

ones tenths hundredths thousandthstenshundreds

Problem 6

adding decimals

148 thousandths + 7 ones 13 thousandths

ones tenths hundredths thousandthstenshundreds

Problem 7

adding decimals

0.74 + 0.59

ones tenths hundredths thousandthstenshundreds

Problem 8

adding decimals

7.048 + 5.196

ones tenths hundredths thousandthstenshundreds

Problem 9

adding decimals

7.44 + 0.774

ones tenths hundredths thousandthstenshundreds

Problem Set (10 minutes)

Do Your Personal Best (Complete independently!)

Student Debrief (10 minutes)

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

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?

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

EXIT TICKET (3 minutes)

Complete the exit ticket and turn in...

HOMEWORK