Untitled Lesson

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SESSION 1
Explore
Converting Measurement
Units

• Convert from larger measurement units to smaller

measurement units.

• Convert from smaller measurement units to larger

measurement units.

LESSON 25 • Convert Measurement Units

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Start

Same and Different

A

yards

1

2

3

4

feet

3

6

9

12

B

kilograms

1

2

3

4

grams

1,000

2,000

3,000

4,000

C

meters

1

2

3

4

centimeters

100

200

300

400

D

gallons

1

2

3

4

quarts

4

8

12

16

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CONNECT TO CULTURE Optional

A futon (FOO-than) is a
traditional Japanese mattress,
which is usually made from
quilted cotton. At night, a futon
can be unrolled and placed on
the floor to be used as a bed.

• What multi-purpose furniture

are you familiar with?

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Make sense of the problem

Robyn’s foster dad buys a futon sofa that is
4 feet wide. Robyn wants to place the futon
sofa in the family room. She measures the
space in inches.

• What is the problem about?

509

Open Ended

Robyn’s foster dad buys a futon sofa that is
4 feet wide. Robyn wants to place the futon
sofa in the family room. She measures the
space in inches.

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Make sense of the problem

Robyn’s foster dad buys a futon sofa that is
4 feet wide. Robyn wants to place the futon
sofa in the family room. She measures the
space in inches. How many inches wide
is the futon sofa? (1 foot = 12 inches)

• What are you trying to find out?
• What information is important?

509

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Solve and support your thinking

Robyn’s foster dad buys a futon sofa that is
4 feet wide. Robyn wants to place the futon
sofa in the family room. She measures the
space in inches. How many inches wide
is the futon sofa? (1 foot = 12 inches)

Math Toolkit ruler, yardstick, number lines,
grid paper, math reference sheet

509

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Share your thinking with a partner

Ask your partner:
Why did you choose that
strategy?

Tell your partner:
I knew . . . So I . . .

509

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Compare class strategies

Robyn’s foster dad buys a futon sofa that is
4 feet wide. Robyn wants to place the futon
sofa in the family room. She measures the
space in inches. How many inches wide
is the futon sofa? (1 foot = 12 inches)

509

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Make connections and explain your thinking

Look at the problem on the previous page. Is
the number of inches in 4 feet greater than or
less than the number of feet? Explain.

510

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Make connections and explain your thinking

You solved a problem using the relationship
between units to find the equivalent measure.
You can use what you know about unit sizes and
operations to convert other measurement units.
The table shows equivalent measurements
of weight.
a. Is an ounce a smaller unit or larger unit than a

pound?

A melon weighs about 2 pounds. How many
ounces is 2 pounds?

Units of Weight

1 pound = 16 ounces

1 ton = 2,000 pounds

510

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Make connections and explain your thinking

You solved a problem using the relationship
between units to find the equivalent measure.
You can use what you know about unit sizes and
operations to convert other measurement units.
b. Suppose a basket of melons weighs

64 ounces.
Is the weight in pounds greater than or less
than 64 pounds? How do you know?

Complete the table to convert from ounces to
pounds.

Ounces

16

32

64

Pounds

1

3

64 ounces = pounds

510

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Close: Exit Ticket

Describe a real-world object that you can
measure using two different units and tell
which two units you could use. Which unit
would you need more of to measure the
object?

510

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Real-World Connection

A robotics engineer designs and
works on robots that perform a
variety of tasks, such as
assembling cars, assisting with
surgery, and exploring Mars.
The robotics engineer must
make sure that the computer
programs that control a robot
correspond to the actions of the
robot in the physical world.

When might it be useful to
convert measurement units?

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Vocabulary

equivalent

measurements

511

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Practice

The picture shows a container with 1 gallon of
liquid. The measurements written on the
container tell how much liquid there is in cups
and in quarts.

Use the picture to write the equivalent
measurement units.

2 quarts = cups 12 cups = quarts

1 gallon = cups 8 quarts = gallons

511

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Practice

Solve the problem. Show your work.
A Sacramento Valley tomato farmer makes
5 gallons of tomato sauce. The farmer fills
1-cup containers with the sauce.

How many 1-cup containers can the
farmer fill?
(1 gallon = 16 cups)

512

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Practice

Check your answer. Show your work.

512

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Take a moment to think
on your own.

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Turn and talk with your
partner about . . .

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REPEAT
Restate the idea to give
everyone a chance to hear
it, or hear it again.

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REPHRASE
Restate the idea in your
own words.

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REWORD
Restate the idea using academic
or mathematical language.

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RECORD
Record ideas using words,
numbers or pictures.

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THREE READS
• Read 1: What is the problem about?
• Read 2: What are you trying to find out?
• Read 3: What information is important?

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CO-CRAFT QUESTIONS
• What is the problem about?
• What questions can you ask that

mathematics can answer?

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NOTICE AND WONDER
• What do you notice?
• What do you wonder?

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SAY IT ANOTHER WAY
• How would you say this problem in

your own words?