Lesson 91:

Estimating and Using appropriate units of measure for volume

1.Drill

Mental computation

Magic Square –Give the next five perfect square.

Review

Find the volume of these prisms. Write the answer on your notebook.

 1.l=9m

w=5m

h=4m

2. s=12cm

3.l=15m

w=10m

h=6m

Presentation

Using concrete object (present an aquarium)

An aquarium is 35 cm. long, 25 cm wide and 33 cm high is to be filled with water.

How many cubic centimetre of water will be needed?

1.What is asked in the problem?

2.What data are given?

3. Is the unit of measure appropriate with the data given?

2.Performing the Activities

a. Group the pupils. Give rectangular prism to each group.

b. Have each pupil first guess which prism has the greatest and which prism has the least volume.

c. Give the unit of measure to be used. Have the students estimate the volume of the rectangular prisms.

. Processing the Activities

What is volume?

How do we estimate volume of a prism?

Have the pupils solve the following exercises.

Write the best unit of measure to find the volume of the following: (mm3, cm3, dm3, m3)

1.water in a rectangular pool

2.an ice before it melts

3.a dice

4.a blackboard eraser

5.oil in a rectangular box

Solve the following word problems.

1.The volume of a rectangular prism is 240 cm³.Its length is 4cm and its height is 6 cm. How wide is it?

Summarizing the Lesson

How do we use appropriate unit of measure for volume?

How do we estimate volume?

.Assessment

1.Marilou’s sewing box is 3 dm long, 2.5 dm wide and 4.3 dm high. What is its volume?

2.Find the volume of a closet which is 2.5 m long, 5m and 2m high

Draw the figure with their measurements and find their volume.

1. l=9m

w=4m

h=6m

2. s=18cm

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.3. 3=30cm

4. l=12cm

w=5cm

h=8cm

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5. s=14cm