1. What kind of things do we weigh?

Think about things in your life that you have to weigh. Are there special situations or places where weight is important? What kind of things do you weigh in your daily life?

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These materials are © Jorge Motta 2012, Towson University, all rights reserved.

2. Units of Measurement

We have so many examples of what kind of things we measure in our lives, but what are the unit of measurements we use to express weight?

There are so many examples! Let’s just focus on three. Take a look at this website:

http://www.mce.k12tn.net/math/measurement/weight_customary.htmNow we know about three

units of measurement for weight. They are:

OuncePound Ton

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These materials are ©, Jorge Motta 2012, Towson University, all rights reserved.

3. What Weighs a Pound?

The website tells us that a loaf of bread weighs about a pound. With this in mind I want you to look around the classroom for objects you think weigh a pound. I want you to record these objects in the chart provided.

Next, I want you take out your iPad and open the Real Scale App. Set the unit of measurement to pounds.

Place the object on the iPad and record the weight of the object on the chart provided

Was your estimation correct? If so, record that on your chart too.

Object Weight Estimate:Correct orIncorrect?

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These materials are ©, Jorge Motta 2012, Towson University, all rights reserved.

4. The Assessment Activity

Take a look at this video of the blue whale. http://www.youtube.com/watch?v=9pjI2XkmoL0The blue whale is the largest animal on Earth. In paragraph I want you to answer the

following question. Do you think scientists use ounces, pounds, or tons to determine the weight of the blue whale? Be sure to include the following:

• What unit of measurement you think scientists use to measure the weight of blue whales?• What objects do you think would be appropriate to use ounces? Pounds? Tons?

Don’t just use the examples on the first website you encountered. Think about other examples you have discovered through our discussions, activity and your life.

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These materials are ©, Jorge Motta 2012, Towson University, all rights reserved.

5. Enrichment Activities

This is a fun game where you have to read a scale to help out Jack the Builder. Click on measuring mass after the introduction page.

http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/measures/index.htmHere is another game! In this

game you have to place animals on a scale to match the weight of a given animal.

http://www.jakers.co.uk/games/seesaw/

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These materials are ©Jorge Motta 2012, Towson University, all rights reserved.

6. Teacher Support Materials

Some things to keep in mind for the lesson For the initial discussion lead students to examples

such as weighing apples at a supermarket or the scales in our bathrooms

Make sure students use the link on the information sources as their reference point. In order words, make it important for students to realize the connection between a pound and a loaf of bread.

Only allow students to test objects on their iPads that are safe to use on the iPads. Even bring in objects that are safe for students to use.

This less is in synch with the Maryland Voluntary Curriculum for Second Grade Math

Standard 3.0 Knowledge of Measurement Students will identify attributes, units, or systems of

measurements or apply a variety of techniques, formulas, tools or technology for determining measurements.

Topic B. Measurement Tools Indicator 1. Measure in customary and metric units Objective: Select and use appropriate units of

measure for length/height, weight, and capacity

Here is the rubric for the brief constructed response: http://rubistar.4teachers.org/index.php?

screen=ShowRubric&rubric_id=2193244To differentiate the lesson, instead of making the brief-

constructed response so open-ended, provide the students objects and give them the opportunity to select the most appropriate unit of measurement.

Image Sources: Scale - http://www.google.com/imgres?

q=scale&um=1&hl=en&client=firefox-a&sa=N&rls=org.mozilla:en-US:official&biw=1152&bih=677&tbm=isch&tbnid=ukXtNtyvqdYjCM:&imgrefurl=http://www.smart-kit.com/s352/good-math-mind-bender-which-coin-is-the-countefeit/&docid=EzwMYIsIviYrcM&imgurl=http://www.smart-kit.com/wp-content/uploads/2007/02/balance-scale-redone.jpg&w=350&h=415&ei=2SSsT_aiKca10QHs3-n6Dw&zoom=1&iact=rc&dur=531&sig=101044226522308418986&page=2&tbnh=158&tbnw=133&start=17&ndsp=21&ved=1t:429,r:7,s:17,i:194&tx=56&ty=79

Bathroom Scale - http://www.canadianliving.com/blogs/health/files/2012/01/bathroom-scale-scales-only.jpg

Bodybuilder – http://image.shutterstock.com/display_pic_with_logo/83138/83138,1166219008,1/stock-vector-man-lifting-weights-2329416.jpg

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These materials are © Jorge Motta 2012, Towson University, all rights reserved.