Topic D a dding and subtracting decimals
STANDARD 5.NBT.2, 5.NBT.3, 5.NBT.7

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

Student Pages
Sprint A & B
Problem Set
Exit Ticket
Homework
MATERIALS NEEDED
FOR THIS LESSON
Student
P ersonal White Boards place value disks
Teacher
Teacher Pages

Fluency Practice
(14 minutes)

Round to the Nearest One
5.NBT.4
1 minutes
Do as many problems as you can.
Do your personal best.
Take your mark!
Get set!
THINK!
8 minutes

Round to the Nearest One
5.NBT.4
1 minutes
Do as many problems as you can.
Do your personal best.
Take your mark!
Get set!
THINK!

Decompose the Unit
5.NBT.1
6.358
Say the number
How many tenths?
_____ tenths _____ hundredths
2 minutes

7.354
Say the number
How many tenths?
_____ tenths _____ hundredths

Round to Different Place Vlaues
5.NBT.4
2.475
S ay the number?
Round to the nearest tenth
Round to the nearest hundredth
2 minutes

2.987
S ay the number?
Round to the nearest tenth
Round to the nearest hundredth

One Unit More
5.NBT.7
Say the decimal that's one tenth more ..
5 tenths
5 hundredths
5 thousandths
2 minutes

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
3
5 hundredths
What is 1 thousandth more than
3
5 hundredths

What is one hundredths more than
4
38 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 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 hundreds tens ones tenths hundredths thousandths

Problem 6 adding decimals
148 thousandths + 7 ones 13 thousandths hundreds tens ones tenths hundredths thousandths

Problem 7 adding decimals
0.74 + 0.59
hundreds tens ones tenths hundredths thousandths

Problem 8 adding decimals
7.048 + 5.196
hundreds tens ones tenths hundredths thousandths

Problem 9 adding decimals
7.44 + 0.774
hundreds tens ones tenths hundredths thousandths

Problem Set
(10 minutes)
Do Your Personal Best
(Complete independently!)

Student Debrief
(10 minutes)
How is adding decimal fractions the same as adding whole numbers? How is it different
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 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