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Multiplying Decimals
Lesson 11
5.NBT.1
5.NBT.7
Table of contents
5.
6.
7.
8.
9.
10.
11.
12.
13.
Leave blank
Application problem/Notes
Notes
Problem set
Problem set
Homework
Show my work
Homework
Show my work
Application Problem
I. After school, Marcus ran 3.2km and
Cindy ran 1.95km. Who ran
farther? How much farther?
3 x 0.2 = 0.6
ones
tenths
0.2
x3
0.6
is 3 sets of 2 tenths
4 x 0.423=
ones
1
Place value chart (uses dots)
tenths
6
1.692
hundredths
9
thousandths
2
Area Model
4 x 0.423=
0.423 on the top boxes
6 x 1.21=
1 one
6 6 ones
6
2 tenths
1 hundredth
12 tenths
6 hundredths
+1.2
+.06
6.000
1.21
1.200
x
+0.006
7.206
6
7.26
Multiplying decimals using
the lattice or algorithmic form
When multiplying decimals, pretend it is
one big whole number
1. Put the biggest number on top
2. Put the smaller number on the bottom
3. Multiply
4. Count how many numbers are after the
decimal
5. Starting at the right, count over as many
numbers as you counted behind the
decimal
6. Put your decimal there
Lattice
1
2
1
1
6
7
2
2
6
6
6
Algorithmic
1
1.21
x
6
7.26
Problem Set (10 minutes)
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


Do your personal best to complete
the Problem Set within 10 minutes.
Some problems do not specify a
method for solving.
Solve them the way that works for
you.
Review your answers with another
student
Exit ticket/Homework

Complete your exit ticket and give it
to the teacher