3 Meaningful Ways to Teach Rounding to the Nearest Hundred

We always start out a new year of math with rounding in the upper grades. Our third graders begin with rounding to the nearest hundred and nearest ten.

And this can be tricky. If students aren’t secure in their place value understanding, they often struggle with rounding concepts and start to fall “behind” as other concepts are introduced…and the year has just begun!

I do believe that rounding to the nearest hundred is a concept my students are able to grasp more easily than rounding to the nearest ten. Rounding those three-digit numbers to the nearest ten can be challenge for many!

(I have a whole post of ideas to support rounding to the nearest ten here!).

Though rounding to the nearest hundred is something my students find to be easier, I love to use this opportunity to build understanding through number lines.

I know this will be a great help in the future when students move on to rounding to any place.

Today I want to share three meaningful strategies that have been so helpful in building a solid foundation as my students learn to round to the nearest hundred.

Use Number Paths and Number Lines

I love to use a sequence of number paths, number lines, and open number lines when teaching rounding to the nearest hundred (more on this in the “Scaffold the Steps” section!).

We always start with number paths first.

You might be thinking ok, but number paths are for younger students. But they are also amazing tools for teaching rounding in the upper grades!

Number paths make it so easy for students to focus on the two hundreds a given number lies between.

And they are extremely helpful in teaching students about the midpoint number, thanks to the visual layout of the path:

Number paths are also a great support for rounding to the nearest hundred, as each box on the path represents ten.

This will be key as we move on to setting up number lines later on!

Represent Numbers with Place Value Disks

When we begin rounding to the nearest hundred, I always ask my students to represent each number with place value disks.

I love to use place value disks, for so many concepts! I have a post sharing how I introduce them to my students here: Introducing Place Value Disks to Students with 4 Guiding Questions.

Place value disks are a priceless tool in supporting students who are not quite solid in place value understanding.

The disks represent each digit and this help students as they set up the two hundreds a given number is between:

Place value disks are also a great support when we start placing more challenging numbers on open number lines.

In this example, students can see how close these numbers are to one another visually with the disks…and then represent these numbers on the number line to understand rounding patterns:

Scaffold the Steps

The strategies above have been key in building a solid foundation for rounding to the nearest hundred…an understanding that is so important for future rounding concepts.

But the greatest strategy of all lies in scaffolding.

I rely on scaffolded steps to build understanding and confidence.

We always begin with number paths…then we move to number lines, then open number lines.

I use scaffolded visuals to help my students who struggle with place value:

And we keep working until we are able to round using simple open number lines, featuring the hundreds, the midpoint, and the number being rounded:

If my students can round on number lines at this stage, they will have greater success when rounding to any place in the future.

Lesson Plans to Start Now

Ready to try these strategies with your students? I know you have enough going on, so I put everything together in a rounding kit for you.

No need to plan a single thing, just print and teach!