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Justifying Function or Not a Function Notes

I created this justifying function or not a function interactive notebook page to help model for my students how to write proper justification sentences. I always get so frustrated when students will say that something is a function or not a function without any explanation.

As we’ve been reviewing for the EOI these past few weeks, my students are still answering with justifications.  Yay!

The check boxes make it seem a little less scary, I think.

justifying function or not a function

Updated Version of Justifying Function or Not a Function Notes

In 2018, I gave this set of justifying function or not a function notes a bit of a face lift!

Notes in interactive notebook on justifying whether a relation is a function or is not a function

Justifying Function or Not a Function Notes 1718 (PDF) (1498 downloads )

Justifying Function or Not a Function Notes 1718 (Editable Publisher File ZIP) (991 downloads )

Susan Raczynski

Wednesday 8th of November 2017

This is awesome! I haven't taught Algebra 1 in quite a few years and I have committed to using and INB. My students love it! I've been making my own and using other resources. This is everything I've been looking for all in one place. Thank you for sharing!

Susan Raczynski

Thursday 9th of November 2017

Also, I can't find the justifying a function foldable. Can you repost?

Santonika Sanders

Saturday 14th of October 2017

I love these! I wish I'd come across them before teaching this already. I think out would have been great to put the independent things on the left and dependent things on the left since it looks like a T-chart on your page. I've been trying to do more interactive things, but the struggle is real! Thank you for the idea of having them cut and glue at the end!


Thursday 25th of August 2016

I'm sorry if this is a duplicate comment, but I just wasn't sure if my last one went through. I wanted to say thank you so much for sharing your work! I am going to use the Function Machine foldable today in class. Have a good one!


Monday 18th of July 2016

Could you please post a copy of your Mastery Tracking sheets for each unit? I love it!

Sarah Carter (@mathequalslove)

Tuesday 19th of July 2016

I'll add it to my list of things to look for!


Wednesday 20th of January 2016

I have never used interactive notebooks but have been interested. How much time does it take for the kids to tape/glue things in? We have only 53 minute periods and a very wide range of ability levels in each class.


Sunday 31st of January 2016


Sarah Carter (@mathequalslove)

Wednesday 20th of January 2016

We have 52 minute periods. Taping/gluing can take a few minutes. I find that if I get through the lesson and let kids tape/glue at the end that they tend to waste less time than if I let them tape/glue before we start the lesson. They use their notebooks for reference A LOT, so I consider the taping and gluing a worthwhile investment.

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