4.5A

4.5(A) represent multi-step problems involving the four operations with whole numbers using strip diagrams and equations with a letter standing for the unknown quantity

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Created by HISD Curriculum using Google® Slides

Multiplication or Division?

Read each of the math stories. Decide if each story relates better to
multiplication or to division. Record your thinking in your math journal.

Directions:

Story 1

Story 2

Story 3

An apartment complex is replacing the
tile floors in 5 of its apartments. The
floor in each apartment has an area of
985 square feet. How many total
square feet of flooring is needed to
replace these tile floors?

Ms. Martinez is preparing the
convention center for a banquet
dinner. She knows 1,128 people will
attend the banquet. Ms. Martinez will
seat 8 people to a table. How many
tables are needed?

Melissa has 13 photo albums. There
are 85 pictures in each album. How
many total pictures does Melissa
have?

Let’s Explore

Created by HISD Curriculum using Google® Slides

Multiplication or Division?

Story 1

Story 2

Story 3

An apartment complex is replacing the
tile floors in 5 of its apartments. The
floor in each apartment has an area of
985 square feet. How many total
square feet of flooring is needed to
replace these tile floors?

Ms. Martinez is preparing the
convention center for a banquet
dinner. She knows 1,128 people will
attend the banquet. Ms. Martinez will
seat 8 people to a table. How many
tables are needed?

Melissa has 13 photo albums. There
are 85 pictures in each album. How
many total pictures does Melissa
have?

Check your responses.

Multiplication

Division

Multiplication

Let’s Review

Created by HISD Curriculum using Google® Slides

Representing Multiplication and Division Stories

Mathematicians represent multiplication and division stories using strip
diagrams and equations.

Let’s look to see how we can represent

one of math stories using a strip

diagram and an equation.

Let’s Review

Created by HISD Curriculum using Google® Slides

An apartment complex is replacing the tile floors in 5 of its apartments. The floor in
each apartment has an area of 995 square feet. How many total square feet of
flooring is needed to replace these tile floors?

Strip Diagram:

We need to find out the total square feet of flooring needed to replace tile floors for 5
apartments. We know that each apartment floor has an area of 995 feet.

995

Represents 1 apartment floor with an area of 995 feet.

Therefore,

995

995

995

995

995

Represents 5
apartment floors
with an area each
of 995 feet.

f = floors

Let’s Review

Created by HISD Curriculum using Google® Slides

An apartment complex is replacing the tile floors in 5 of its apartments. The floor in
each apartment has an area of 995 square feet. How many total square feet of
flooring is needed to replace these tile floors?

Equation:
995 x 5 = f

995

995

995

995

995

Represents 5
apartments floor with an
area each of 995 feet.

floors
=
f

1

2

3

4

5

Let’s Review

Created by HISD Curriculum using Google® Slides

Math Story

Strip Diagram

Equation

An apartment complex is
replacing the tile floors in 5
of its apartments. The floor
in each apartment has an
area of 995 square feet.
How many total square feet
of flooring is needed to
replace these tile floors?

995 x 5 = f

4.5A add and subtract

​Strip diagrams add and subtract

​You will learn to solve problems using strip diagrams, equations, and variables.

​Watch this video.

​4th grade

• ​Watch how she write her equations and solve for the variable.

Rounding /Estimation

Let's Review 

How to Answer a Rounding Question 

• Circle the place value that you are rounding to. 

• Underline the digit to the right out it. 

• Ask yourself if this number rounds up or down. Remember 4 or less, let it REST. 5 or more RAISE THE SCORE.

• Then round accordingly. 

Estimation 

Use estimation to get numbers that are easier to solve with. 

​Estimate - a rough judgment of a number.

​When do I need to estimate?

• To make sure my answer is reasonable.

• When I only need an approximate amount.

• To solve for an amount quickly.

How do we estimate?

Use your rounding skills BEFORE you solve!

Four or less, let it rest. Five or more, raise the score!

​A good rule of thumb is to round to the largest place value of the smallest number.​

For example: 5,480 + 367 ----> round to the hundreds place!

​Let's look at this word problem.

​Two local elementary schools are raising money for holiday toys for families in Augusta County. Clymore raised $11,037. Riverheads raised $9,735. About how much more did Clymore raise than Riverheads?

​

What key word do you see? How should we solve?​

​