ahh
LOGIN / SIGN UP
Te Arapiki Ako
"Towards better teaching & learning"
 

Benchmarks for weight


Comment on this item  
 
Add to your favourites
Remove from your favourites
Add a note on this item
Recommend to a friend
Comment on this item
Send to printer
Request a reminder of this item
Cancel a reminder of this item
Share |
Last updated 26 October 2012 15:28 by NZTecAdmin
Benchmarks for weight (PDF, 38 KB)

Measurement progression, 4th step

The purpose of the activity

In this activity, the learners develop an understanding of weight and mass. The learners also develop their skill at using benchmarks of 1 kilogram and 500 grams to aid in estimating the weight of given objects.

The teaching points

  • The learners will understand the need for having and using standard measures of weight (kilograms and grams).
  • The learners will know the conversions between kilograms and grams (1,000 grams = 1 kilogram)
  • The learners will develop and then use benchmarks (for example, visualising the weight of 1 kilogram) to carry out estimation tasks.
  • Discuss with the learners relevant or authentic situations where the understanding of kilograms and grams is necessary.

Resources

  • Weighing devices for objects less than 3 kilograms (as applicable: electronic, analogue, spring, balance scales).
  • Objects that weigh 1 kilogram (for example, 1 litre of milk, a 1-kilogram block of cheese) or 1/2 kilogram (for example, a block of butter, a tub of margarine).
  • A range of objects.
  • Supermarket bags.

The guided teaching and learning sequence

1. Begin by showing the learners three ‘closed’ supermarket bags (labeled a, b, c) and posing the questions:

“Which is the heaviest?”
“Which is the lightest?”

Give the learners the opportunity to lift the bags and make their decision.

Check that everyone agrees on the heaviest and lightest bags. If not, ask those who disagreed or who were uncertain to directly compare two of the bags by holding one in each hand. Ask the learners if they have any idea about the weight of the heaviest bag.

“How heavy do you think the heaviest bag is?”
“Why do you think that?”

2. Discuss the difficulty of estimating the weight of objects. This is usually due to the fact that we don’t have much practice at estimating weight. Also we don’t have the same ‘personal’ means with which to benchmark like we do for length (for example, fingertip to shoulder is about 1 metre).

3. Ask the learners to suggest objects that could be used as benchmarks for a 1-kilogram weight. Possibilities include: 2 tubs of margarine, 2 blocks of butter, a litre of milk or juice, a kilogram of cheese.

4. Check the learners understand that the metric prefix ‘kilo’ means 1,000.

“What does kilo stand for in kilogram?”
“How many kilograms in 2,000 grams?”
(2 kilograms)
“How many grams in 6 kilograms?”
(6,000 grams)

5. Distribute a 1 kilogram and 500 gram object to the learners working in groups. Give the learners the opportunity to handle the objects.

6. Prepare a number of labelled bags filled with objects that in total weigh between 200 grams and 3 kilograms. Ask the learners to estimate the weight of each bag using the following ranges:

  • under 500 grams
  • 500 grams to 1 kilogram
  • 1–1.5 kilograms
  • 1.5–2 kilograms.

7. Examine with the learners the weighing devices that you have available, discussing the level of accuracy permitted by each device. Also discuss with the learners the purpose of having standard units of measure so weights can be accurately communicated.

8. Ask for volunteers to select one of the bags from above and weigh this on a set of scales. Use this to check the accuracy of estimated weights and to reinforce the correct use of the weighing device.

9. Ask:

“What would you use to estimate 20 grams if you didn’t have a measuring device?”

10. Next ask learners to work in pairs or groups to fill a plastic bag with rice so that it weighs 20 grams.

11. Give the learners the opportunity to check their estimates on the measuring devices.

Follow-up activity

Ask the learners to fill a bag with objects until they estimate that the bag weighs 1 kilogram. Use measuring devices to find the ‘winner’.

Return to top

Comments

 

10 October 2016 21:11
Glad you shared the document, Benchmarks for weight at http://www.rushmypapers.org/ This pdf file was pretty informative and impressive. I was able to learn skill at using benchmarks of 1 kilogram and 500 grams to aid in estimating the weight of given objects.
21 October 2016 01:09
I am quite glad that I came across this post about Malta and the standard measures of weight, kilograms and grams. Just like some corruption and legal news, from this website this post was no less helpful and informative. Thank you!!
10 February 2017 19:15
10 best mountain bikes under $500 Buy a Mountain bike! Which one? I will show you in my review the best choice for best mountain bikes under $500. All you need to know!
10 February 2017 19:16
Buy a Mountain bike! Which one? I will show you in my review the best choice for best mountain bikes under $500. https://wowconsumers.com/best-mountain-bikes-under-500/ All you need to know!
03 June 2017 21:30
Awesome. Thank you for sharing the document here. Your document will help your visitor to know details on this topic. I am sharing your site with my friend , I think this informative writing will help him to know more about this . I am writing on bicycle. here is my article link please have a look http://www.bikejar.com/best-mountain-bikes-under-500/
24 June 2017 17:31
A well mannered artice to understand weight metrics, I would like to see these type of posts in near future. In a meantime, have a look at my bicycling site: http://mountrides.com/best-mountain-bikes-under-500-dollars/
24 June 2017 17:34
I've been looking around and some places tell me pounds is a english unit of weight and other tell me it's a unit of mass i.e lbf and lbm. I thought it was a unit of weight but i'm not so sure because you're able to convert kg to pounds right and kg is a unit of mass not weight. Thankfully, this article cleared all my confusions. In a meantime, have a look at my fishing site: http://kayakflow.com/best-fishing-kayak-under-500/
Only registered users may comment. Log in to comment

Search this section

Knowing the Demands Knowing the Learner Knowing the What to Do

News feeds

Subscribe to newsletter