Transcript Module 3 Lesson 1

February 2,2015
 Twenty-four
people line
up to use the canoes at
the park. Three people
are assigned to each
canoe.
 How many canoes are
used?
 There

3
3
 The
are 3 people in each canoe.
= 24
3
3
3
3
3
3
people
people use 8 canoes.
 3 X ? = 24

?=8



Usually the students are used to seeing a
blank or a ? to indicate a missing factor.
Now we are transitioning to using letters to
represent the unknown number in a
multiplication problem.
Students should be able to question
themselves about what the problem is asking
and the reasonableness of their answers.



The blanks have been
filled in according to the
fact family number that
makes sense for the
problem.
The same thing would
happen for a division
problem that correlates
with that fact family.
Please check student
notebook for more
examples.

Looking at the letter
that represents a
number, the student
must decide which
number fits in the
space to make the
number sentence true.

Please talk to your
scholar about avoiding
the letters to the right
because they have a
tendency to resemble
other numbers and
symbols in
mathematical
equations.
 At
a table tennis tournament, 2
games went on for a total of 32
minutes. One game took 12
minutes longer than the other.
How long did it take to complete
each game?
 Use a letter to represent the
unknown. Solve the problem.

Using the numbers that they have given us first,
we must write an equation.
 32-12= n
 n=20
 We subtracted because one game was 12 minutes longer that
the other game.

Now we must solve for the second part of the
question.
 n= 20 so I must write a new equation. There are two
games so how long does each game take now?
 20 divided by 2= g
 g= 10

One game took 10 minutes. 10 + 12 = m


m=22
The other game took 22 minutes
 Check your work
22 min+10 = 32 min.