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## Domain and Range Lesson

A few weeks ago, I agreed to teach a lesson on domain and range in a Math 10C class. I told the teacher I’d make it interesting and engaging. Shortly after making that promise, I realized I had no idea at all how to make it interesting and engaging. I did what I always do in those situations. I begged for help on Twitter.

It turns out I wasn’t alone in looking for ways to teach Domain and Range. Marshall Thompson admitted he was also interested in finding something. Don’t worry, Marshall, I’m about to hook you up.

Dan Meyer jumped in and was, as advertised, not all that helpful. And he spelled cheques wrong.

I had given up hope. I was about to plan a typical boring lesson. Then Peter Vandermeulen came through.

Peter’s link was to this file. It’s really all you need. It’s a nice, fun, compelling and engaging way to get at Domain and Range. Peter tells me he got the idea from a workshop in his district. I made some additions and modifications, and I’ll explain the lesson below. I’ll present it how I would do it if I ever did it again. I learned a few things.

Domain and Range Lesson (2 Classes)

Introduction and Hook – Pictionary

Run off the documents below. They contain some blank grids and lots of different types of graphs. Cut them out. The idea is that one student will be given a graph and have to describe it to a partner, who will draw it without looking at it. You make it tougher if you don’t let the describor see what the describee is drawing until the graph is done.

There are two ways you can go from here. Peter’s lesson plan suggests pairing students off and giving them each one graph and one blank. Partner 1 describes his graph, while partner 2 draws. Then they switch. I’d put a time limit of 1 minute on each drawing. When the time is up, they can look at the original and the drawing and see how accurately the drawer was able to replicate the graph based only on the verbal description of the partner.

I tried to make this competitive, like pictionary. I put them in teams of 2 and had them compete against another pair. I photocopied  the completed graphs on card stock and gave each group of 4 the whole set, shuffled and face down. Each student was given the sheet with the blank graphs on it. Then the students took turns pulling the top card, and describing it to their partner. The pair sitting out in a round had to judge and decide if the pair doing the drawing did well enough to earn a point. I tried my best to make sure that the person describing the graph couldn’t see what his partner was drawing. It’s much more challenging that way. We played 12 rounds of 1 minute each, so that each student got to describe 3 times and draw 3 times. The competition was fun, but the noise level got pretty high in the room. Peter’s way might be simpler, quieter,  faster, and every bit as engaging.

Graph Templates

• Word document so you can modify my graphs if you want.
• PDF file in case my graphs look terrible when you open them with your version of Word.

The Lesson

After the game, have a class discussion about what kind of words they were using to describe the graphs to their partners. Students will throw out words like arrow, axis, quadrant, stops, keeps going, points, curves, straight, ends, begins, lowest, highest, farthest right, farthest left and more. Their language leads nicely into domain and range.

Give every student two different coloured pencil crayons for the domain and range lesson. Walk them through several graphs from the game, and show the set notation appropriate to the various types (set of points, between two values, going on forever in one or both directions). All I did was make a quick notebook file with screen shots of some of the graphs from the game. What I tried that was new to me, was using the coloured pencil crayons. I asked students to identify the farthest left and right points, mark them, and then colour the x-axis in that same colour. Then I had them switch colours, find the highest and lowest points, and colour the y-axis in that colour. It really made the domain and range pop out for them.

Formative Assessment

After the brief lesson, give them a short sheet with 3 questions. In a 60 minute class, this will pretty much be an exit slip, which is what I called it. In an 90 minute class, you’ll have time for the next part. Use the exit slip to see who understood the lesson, and who needs more help. As students hand them in, you can sort them pretty quickly. I sort them into three piles – “Got It”, “Mostly Got It”, and “Didn’t Get It”.

Day 2

Practice Time (I use this instead of assigning homework) Group the kids according to how they did on the exit slip. Those in the “Got It” pile are given some higher level questions to practice. Normally, I just pull these right out of the student resource. Those in the “Mostly Got It” pile are given some basic practice questions, as well as some higher level practice questions. Those in the “Didn’t Get It” pile work with me. We will go over some more examples together before I turn them loose.

Closing Activity

Peter’s materials contained a set of cards that I used for a closing activity. Half the cards have domains and ranges on them, and the other half have corresponding graphs on them. I didn’t modify these at all, and used them as-is. Peter’s lesson plan suggests giving each student one card, and having them match up with the person who has the corresponding card.

I went a slightly different way. I copied these cards on coloured card stock and separated the kids into groups of 4-5. I gave them an entire set of cards and had them pair them all off, working as a group.

Closing Activity Materials

My Thoughts

Thanks to Twitter, I think I delivered a way better lesson than I used to do on this topic way back when I was in the classroom. I’d like to try this lesson once more, exactly as described here. It is ready to go. If you try it, let me know how it goes for you.

### 24 Responses

1. Hi John,
This is a brilliant lesson! Thanks so much for sharing it. I shared it with the Math teachers in my school as well as our district consultant.

2. I played an “Inverse Pictionary” game last year with an algebra 2 class – very fun. The goal was to use math terms (increasing, decreasing, relative min/max, intercepts, etc.) I played 2 kids at the board against each other with the winner being the kid who drew the correct graph first.

As for domain and range, I’ve found that starting with a real-world graph gets the kids understanding the concept before we go to very mathy graphs. I use gapminder and we have wonderful discussions about functions (life expectancy vs. GDP – NOT a function; life expectancy vs time – function.) Life expectancy in the US over time D: {x|1800 < x < 2009}, R: {y| 40 < y < 78}. We talk about some good math words, too – if we look at child mortality, do we expect the graph to decrease or increase over time? What caused the number of children per women to sharply decrease after the 1950s? Good stuff. They actually pick their heads up off the desk for the first time in math class during the domain/range lesson, which is weird.

3. That is and excellent exercise. Here is an similar, interactive exercise. Press the rest icon and get a new problem each time. http://media.lanecc.edu/users/gettyst/Geogebra/domrang.html

4. Check out http://www.desmos.com. There are lots of interesting creations that were created using domain/range restrictions.

5. I’m not that much of a online reader to be honest but your sites really nice, keep it up!
I’ll go ahead and bookmark your site to come back later. Many thanks

6. Love it! Thank you for taking the time to link the documents, love the sharing attitude. I super appreciate you! 🙂

7. on October 24, 2013 at 11:41 am | Reply Suzanne Milkowich

I really loved this lesson! I used it this week in my Algebra 2 class and they really enjoyed it. I will be using it again!

8. I remembered this activity from a while back but I didn’t remember where I saved it. I googled “domain and range cool” and there it was! Lucky me!

• What did we do before Google?

9. Tried this today when I found your site last minute. The only change I made was that I did not print out the picture cards. I only printed out the graphs. I put the class into groups of two with one students back to the smartboard. I then projected a card for everyone to describe and the other to draw. I thought it was really fun and nice that they were all working on the same card. I was going to schedule my observation for this lesson but I chickened out. Thanks again.

• Glad it worked. I like the modification you made. I like to be observed when I’m trying something new and/or strange. That way I show that I’m willing to try that kind of stuff, and if it goes badly we can have a conversation about why that was and what I could have done differently.

10. Thanks!

11. […] Pictionary (John Scammell) […]

12. This is awesome!! Thanks for sharing!

13. […] do so, I searched for domain and range activities on Google and found this post by John Scammell. The post has a detailed description of how he did the activities and includes files for other […]

14. […] card sort – Stolen shamelessly from John Scammell (https://thescamdog.wordpress.com/2012/10/26/domain-and-range-lesson/).  I only used his closing activity as I had already taught the material.  Students worked in […]

15. […] next week of this unit focused on x- and y-intercepts and domain and range. I just discovered this awesome lesson idea for domain and range AFTER I taught it, of course (found it on this awesome resource) but overall I think that domain […]

16. Valuable info. Lucky me I found your web site by accident, and
I am surprised why this accident didn’t happened earlier! I bookmarked it.

17. Bạn đang cần sự hổ trợ chuyên nghiệp điều khoản liên quan đến bên giám sát xây dựng (nếu có), điều khoản về cách tính
chi phí phát sinh khi có thay đổi trong quá trình
xây… hiệu quả nhất Đó là những tiêu chi giúp bạn chọn cho mình một
nha thau xay dung tốt nhất. Hiện tại công ty Phố Việt là một trong những nhà thầu uy tín để bạn tin cậy lựa chọn..
công ty nguyễn Hoàn Với đội ngũ kỹ sư đã trải qua
nhiều dự án cùng với tâm huyết trong quá trình thực hiện công việc.

nhà thầu cam kết sẽ đêm đến những giá trị tốt nhất cho gia chủ…..
Bình Dương Quy định An toàn lao động và bảo hiểm, Quy định tuân thủ nội quy
sinh hoạt địa phương, Hình thức và
thời hạn thanh toán… Đơn giá xây nhà trọn gói phần thô từ 2.600.000đ/m2 – 2.900.000đ/m2, hoàn công giá từ 500.000
– 4.000.000đ/ m2
xay nha tro

18. bận muốn xây dựng nhà trọ Phụ thuộc vào thời tiết, làm nhà vào cái nắng gay gắt tháng
5 tháng 6 của Hà Nội sáng 10h đã nắng gắt rồi,
chiều 3h mới túc tắc làm được, thợ làm một tí lại chạy thì một ngày chẳng làm được bao nhiêu việc, kéo
theo chi phí nhân công cũng cao lên….. khai thác hết tiềm năng nhà trọ Chi phí khác: ngoài
chi phí xây dựng này còn chi phí mua sắm nội thất, đồ gia dụng và khá nhiều chi phí khác.
Chẳng hạn: chi phí thiết kế, xin phép xây dựng…
công ty chúng tôi chuyên xây nhà đẹp Cách tính trên đây chỉ
là khái toán mang tính ước lượng, tham khảo cho các gia đình đang lên kế hoạch xây nhà.
Để có thể biết chính xác nhất về chi phí xây dựng nhà vẫn là….Hà
Nội Bóc tách khối lượng, lập bảng tính toán chi phí chi tiết từng hạng mục công việc – theo ngôn ngữ xây dựng đó gọi là Bảng dự toán xây dựng công trình.…
Đơn giá xây dựng của công ty chúng tôi rẻ nhất tại Việt Nam
xay nha binh duong

19. Thank you so much for sharing this lesson! I am a novice at teaching Algebra and I was desperate for getting help for this particular lessons. Thank you!!

20. I am doing this for the third time this year. And it has always been such a hit. Thanks for sharing!

21. This was great! Thank you so much – I think my students understood domain and range much better after this lesson. I also had them compete – loud but fun 🙂