In mathematics, an **equation** is a math sentence that shows two *expressions* that are **equal**. Understanding that these two expressions **must stay equal** is foundational as kids begin to learn Algebra. It is also important and useful as kids begin to write proofs or solve more difficult problems, because sometimes an expression is not written in a convenient way. But *re-writing it* in a way that is **still equal** (i.e. doesn’t change the problem) is an incredibly useful technique and one that I think is often not taught or explained well in high school math classes. This **equal or not equal place value sort** is intended to help kids practice writing in **expanded form**, as well as reinforce the idea that expanded form is **just another way to write the number**. It is *not* something new or different.

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Understanding place value is an essential math concept for early math learners. It’s important as students begin to add and subtract larger numbers, compare quantities and make sense of more complicated math.

But it is equally important that kids understand that expanded form is just another representation of the same number.

As kids get older and the math more complicated, they will be better able to problem solve and think outside the box if they are able to think of **numbers and expressions in other ways**.

As a high school teacher, I often saw kids struggle with factoring. They wanted to memorize a procedure, or just guess random numbers based on examples they saw, without actually understanding what they were doing.

I tried to explain over and over again that factoring is just *writing an expression another way*. Re-writing it as two things multiplied together, just as 15 **is equal to** 5×3.

This is also good practice for students to get in the habit of **checking their work**. Most kids, once they have completed a problem, are done. Solving it was so much work, who wants to go back and actually check to see if it’s right?!

But checking for accuracy is a habit we should encourage from an early age. This activity will allow students to look for mistakes and practice “checking their answers.” They have to use what they know about numbers and evaluate what is written and determine if they *actually are equal*.

#### To Use the Equal or Not Equal Place Value Sort:

Very little prep is required for this super-hero themed lesson! Simply print the “equal” and “not equal” mats, as well as the equation cards. For durability, I suggest printing on card stock and laminating the pieces.

Then, cut out the mats and cards and let your students sort them based on whether or not the equations are equal!

I would encourage you to discuss the problems together (either as a class or in small groups) and be sure to ask students to explain **why** something is equal or not equal. This will allow them to explain **in their own words** what they understand about place value and expanded form.

A great way to get kids talking? **Ask them to prove it**. “Oh really? Those are not equal? Prove it!”

This would also be a fun **partner activity**. Have students split the set of equation cards and take turns sorting them, explaining their decision to each other as they go.

If you’d like to use this activity with your students, download it free below! Included in the download are the **equal/not equal mats** as well as **18 equation cards to sort **(including numbers to the thousands place).

**{Click HERE to go to my shop to download the “Equal or Not Equal” Place Value Sort!}**

I hope this is a useful and meaningful activity for your students, and helps them understand the importance of place value, and checking their work!

#### For more place value activities, check out one of the following posts:

- Expanded Number Puzzles
- Place Value Lessons to use with the book,
*Sir Cumference and All the King’s Tens*

Enjoy!

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Leslie says

November 20, 2015 at 11:54 amI really like the idea of the sorting mat!

Thanks,

Leslie

Bethany says

November 20, 2015 at 2:33 pmThanks Leslie!

Tidy Teacher says

November 20, 2015 at 2:13 pmLove your FREEBIE! This is a great resource to add to math place value. Thanks!

Bethany says

November 20, 2015 at 2:33 pmGlad you like it, hope you find it useful! 🙂

CabotMama says

November 22, 2015 at 11:57 pmHave you been spying on my homeschool room?! The timing of this freebie is perfect!! My third grade daughter is struggling with expanded form. I thought she understood when working thru the chapter on it, but when she missed almost every cumulative review problem a couple of chapters later, I decided we needed to table the next chapter on graphs and spend an extra week reviewing expanded form. There were tears the first day, but by the end of the week, she was doing much better. She still struggles when there is a 0 in a place value. (ie 305) I think this game will be a fun way to practice, without the drudgery of worksheets, writing out her answers, etc. Thank you!!!

Bethany says

November 23, 2015 at 12:04 pmYou are SO welcome! Place value is SUCH a tricky concept, especially when there’s a zero thrown in there somewhere! I’ve had high schoolers struggle with Algebra problems because they would forget to use a zero as a place holder. This is such an important concept to master, and continue to use and review! I hope she has fun with this, and I think you made the right choice to slow down and work on it some more! 🙂

Lisa F says

October 29, 2017 at 6:25 pmThank you for ALL you do! Love ALL of your works!