Module 3
Lesson 6
Objective
• Write base ten numbers in expanded form
Warm up
• Write 832 in place value and unit form
• 8 hundreds
• 3 tens
• 2 ones
832
800
30
2
Meter strip addition
Rules: Drag your finger from zero to 27cm. Then slide up 35 more
centimeters. You might first skip-count by ten three times, then go
up 5 ones.
Count up
• If I say 324 you say 3 hundreds 2 tens and 4
ones
• Let’s give it a try
• 398
• 890
• 174
• Timmy the Monkey picked 46 bananas
from the tree. When he was done, there
were 50 bananas left. How many
bananas were on the tree at first?
• Close your eyes and visualize Timmy and all of
the bananas.
• Whisper to your partner what you could draw
to show what you see.
• What is the question asking? Reread.
• Share your thinking
• Is there another way to solve it?
• Timmy the Monkey picked 46 bananas
from the tree. When he was done, there
were 50 bananas left. How many
bananas were on the tree at first?
• The tree had 96 bananas before Timmy
picked them.
Expanded form in Unit Order
Hundreds
Tens
Ones
2
4
3
100 100 10 10 10 10 1 1 1
• Read this
number to me
in unit forms.
• 2 hundreds
• 4 tens
• 3 ones
• Great!
• Let’s count to
243 in bundles
Expanded form in Unit Order
• Each time we
Hundreds
Tens
Ones
• Explain to your
count a new unit,
neighbor
whyit
we are adding
this
is the
to what
wesame
had
as
243
before.
100 +100 +10 +10+10 +10+1+1 +1
•• Let’s
add this
Let’s reread
together
with addition
symbols
2
200
4
+
40
3
+
3
=
Let’s add the total of each unit
Hundreds
Tens
Ones
2
4
3
200
+
40
+
3=
243
Now again give me the addition sentence that adds up the total of each
unit.
What happens if we move the units
around?
+1+1+1 +100+100
10+10+10+10
243
100+100 + 10+10+10+10
+ 1+1+1= 243
40
+
3
+
200 = 243
Can someone explain what they understand
about the order of the units and the total
value?
Review
• What is 2+4+3?
• What is 3+4+2?
• Explain to your neighbors why these
totals are equal.
• When you add it doesn’t matter if the
parts are switched around.
So 2+4+3 = 3+4+2
And 200+40+3 = 3+40+200
Now you do it!
• Practice the Skills we
just learned in your
problem set.
• Rotate for your math
groups to practice
skills more math
skills.