Transcript Adding Decimals

Adding Decimals
Lesson 9
5.NBT.1
5.NBT.4
5.NBT.7
Table of Contents for lesson 9
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Lesson 9 Sprint
Notes: Adding decimals
Answers to problems in the notes
More notes
Problem set
Problem set
Problem set: show my work
Homework
Homework: show my work
Homework
Homework: show my work
Sprint: Rounding to the nearest one
Materials needed:
Lesson 9 Sprint A
Directions:
Round as many numbers to the nearest
whole number in two minutes.
Glue this worksheet onto page 3 of your
notebook.
Decomposing the Unit
p. 2
6.358
…is 6 and 358 thousandths
How many tenths are in 6.358?
63
Think about it using money. If you had 63
dimes, you would have $6.30. So there
are 63 tenths in 6.358.
I. 6.358=63 tenths and __ hundredths
tens
ones
tenths
hundredths
thousandths
6
3
5
8
Round 2.475
In your head, round the number to the
nearest tenth.
2
.4
7
5
ones
tenths
hundredths thousandths
Remember: anything less than 5 gets rounded down;
anything 5 or greater gets rounded up
Round 2.475
If you didn’t get
2.5, then take notes on the information below.
2
.4
7
2
2
.4
.5
8
Ones
1
tenths
.1
hundredths
.01
5
thousandths
.001
II. What is 2.475 rounded to the
nearest hundredth?
One Unit More
What is one tenth more than .5?
.6
III. What is one more hundredth?
IV. What is one more thousandth?
Ten baseballs weigh 1,417.4 grams.
About how much does 1 baseball weigh?
= 1417.4
141.74 is
1417.4
1
10
of
1 baseball weighs?

Round your answer to the nearest
tenth of a gram.
141.7 grams
1 baseball weighs?

Round your answer to the nearest
gram.
142 grams
Answer in your notebook
V. If someone asked you, ”About how
much does a baseball weigh?”
which answer would you give?
Why?
2 tenths + 6 tenths
=8 tenths
Looks like?
.8
VI. How is this the same as a whole
number addition problem?
2 ones 3 thousandths + 6 ones 1
thousandth
Looks like?
1
1/10
1/100 1/1000
2
0
0
3
6
0
0
1
8
0
0
4
2.003+6.001
2 tenths 5 thousandths + 6 hundredths
1
1/10
2
0
2
0.205+0.060
1/100
0
1/1000
5
6
6
0
5
1.8 + 13 tenths
13 tenths is the same as 1 one and 3 tenths or 1.3
Dots can be used with a place value chart to find the answer
Each time you have a group of ten, you remove them from the count
and add one to the next higher unit
2.45+3.702 =6.152
ones
tenths
hundredths
thousandths
Adding decimals by using base-ten
blocks
video
Problem Set


p. 5&6
Do your best to complete the
problem set in the next ten
minutes.
After the ten minutes is up, quietly
compare your answers with another
student who is finished.

If your answers differ, try to figure out
why and determine the correct answer.
Exit ticket/Homework


Complete your exit ticket and give it
to the teacher
Begin your homework
p.8 homework
 p. 9 show my work
 p. 10 homework
 p. 11 show my work

Click on the picture for a decimal song!
Videos

Learnzillion 2/5


Learnzillion 3/5



Use a number line to add decimals
LearnZillion 5/5


Use base-ten blocks to subtract decimals
Learnzillion 4/5


Use base-ten blocks to add decimals
Use a number line to add and subtraction decimals
Bad song
Lining up decimals