Today, I just want to write a quick post about a #MTBoS resource that I hope everyone is already familiar with. I used it a couple of weeks ago in my classroom, and the experience was such a fun, positive one!

The idea is that there are four pictures. Each of the pictures could be the answer to Which One Doesn’t Belong? Your job is to find a reason why each picture doesn’t belong.

I used this as one of my Figure It Out! Fridays a little while back. I tossed this picture up on the SMART Board and asked “Which One Doesn’t Belong? “

I intentionally didn’t tell them at first that each one of them had a reason it didn’t belong. Instead, I let one student claim that the shaded square didn’t belong. Another student claimed that the pentagon didn’t belong. I stood there and watched them start to argue it out before stepping in and saying that there was actually a reason why each of them didn’t belong. The bottom right shape gave my students the most trouble. This was a great exercise in practicing precision with our vocabulary and explanations!

After we found a reason for each one, I tried to move on to our lesson of the day, but students protested. They wanted to do another! So, I ended up putting this one on the screen, too.

As the day progressed, it was interesting to see the different reasons different classes came up with fo a card not belonging! I like how this promotes critical thinking, thinking outside the box, and justifying your answer.

You can find plenty of these puzzles at WODB.CA. They are broken into three categories: shapes, numbers, and graphs.

I'm looking for WODB pictures for kindergarten. Any suggestions?

Unknown

Friday 11th of September 2015

I was literally visiting your blog this afternoon to find links for "Which One Doesn't Belong?" and I'm so happy you wrote this post to make me search easier. :)

I plan on using these as warm-ups for my Algebra 2, Algebra 1, and Geometry students. I'm hoping that it generates some good conversation.

Sarah Carter (@mathequalslove)

Monday 14th of September 2015

Ha ha - perfect timing!

JGR314

Friday 11th of September 2015

Here is a sequence completion puzzle/game that has a similar philosophical spirit to WODB, from one of Denise Gaskin's post: math with many right answers

Of course, the idea of extending a sequence in different ways is not novel, but, in practice, I often find it hard to come up with satisfying justifications. The examples in the post are really helpful.

Anonymous

Sunday 24th of February 2019

Dot cards, addends for 5 or not 5,

mavis

Wednesday 7th of March 2018

I'm looking for WODB pictures for kindergarten. Any suggestions?

Unknown

Friday 11th of September 2015

I was literally visiting your blog this afternoon to find links for "Which One Doesn't Belong?" and I'm so happy you wrote this post to make me search easier. :)

I plan on using these as warm-ups for my Algebra 2, Algebra 1, and Geometry students. I'm hoping that it generates some good conversation.

Sarah Carter (@mathequalslove)

Monday 14th of September 2015

Ha ha - perfect timing!

JGR314

Friday 11th of September 2015

Here is a sequence completion puzzle/game that has a similar philosophical spirit to WODB, from one of Denise Gaskin's post: math with many right answers

Of course, the idea of extending a sequence in different ways is not novel, but, in practice, I often find it hard to come up with satisfying justifications. The examples in the post are really helpful.

Sarah Carter (@mathequalslove)

Monday 14th of September 2015

I like this idea! Thanks for the link!