# ROUNDING NUMBERS on a number line HALLOWEEN MATH CENTER ACTIVITY

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Pumpkin Rounding Math Center

Pumpkin ROUNDING to 10, 100, and 1000 TASK CARDS / MATH CENTERS Common Core

Rounding numbers is a math skill that is easy to teach if you train the kids how to circle a number, underline another, apply a rule, etc. Heck, I’ve even patted myself on the back for making up a catchy little ditty which helped my friends to all ace the rounding questions on the state assessment. Unfortunately, that did not mean they understood the concept or that they could apply it to real world situations. It’s important to teach our little friends about what rounding actually means and to further develop their understanding of the number system.

I think it is important to set a purpose for learning in all instances, but this is true for rounding in particular. We round numbers when estimating is “good enough” and because they are easier to work with in our head. Since rounding “in real life” doesn’t involve a pencil and paper to circle and underline it doesn’t make sense to teach it that way.

Have you met my friend The Open-Number Line?

We weren’t really all that close at first.

In fact, he kind of rubbed me the wrong way. I like rules and clear cut guidelines. He was far too wild and unpredictable for my taste.

But then I took the time to get to know him better. And I learned we had addition in common.

Then I had some students who really struggled with subtracting “big” numbers and he was there to lend a helping hand. From that point on I was totally in love.

We’ve been BFFs ever since.

And I really encourage my students to make him a Bestie as well. He is great for oh-so-many concepts...elapsed time....fractions...he’s got it covered.

Rounding is another area in which he excels.

To show your friends how to round, start with rounding to the nearest ten. Draw a number line and label each end with a consecutive multiple of ten (for example 20 and 30). Add a number in the middle (in this case 24). Guide the students to see that 24 is closer to 20 than to 30. Do the same with 27 and guide them to see that it is closer to 30. Explain that when a number has a 5 in the ones place it is exactly in the middle of two 10s, but that we always “round up.”

Once your students are comfortable working with tens, repeat the process using hundreds.

Since rounding is one of the Common Core Standards it is getting far more attention in my classroom than ever before. And so I decided to capitalize on the excitement that is the month of October and created a center and task cards to provide some additional practice for my friends.

The packet includes activities for rounding to the nearest 10, 100 and 1000 so it is great for differentiating to meet the varied needs os your students. It includes 7 different printables with open number lines to help students practice rounding on a number line. I suggest laminating the mats or inserting them into plastic page protectors and using dry erase markers for initial proactice. You could also use a document camera to teach this as a whole class lesson. It may be helpful for some friends to visualize the number line bent like a hill which is why I included the hill clipart with the number line. I placed one of the pumpkins onto the number to show that the pumpkin would “roll” towards a multiple of 10...or 100...or 1000.

The packet also includes 3 sets of task cards (24 cards each) and a recording sheet. The “task card” format is so much more exciting for students than a traditional worksheet.

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Please visit my blog, The Clutter-Free Classroom (www.CFClassroom.com), for daily tips, ideas and photos for managing and organizing your classroom.

It is appropriate to be used with students in grades 1-5 depending on individual levels. I would consider it ideal for grades 2-4 and is aligned with the followingCommon Core Math Standards:

CCSS.Math.Content.3.NBT.A.1 Use place value understanding to round whole numbers to the nearest 10 or 100.

CCSS.Math.Content.4.NBT.A.3 Use place value understanding to round multi-digit whole numbers to any place.
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