Rounding to the Nearest 10 and 100: a Sequence for Success

Though rounding to the nearest 10 and 100 using place value is technically a third grade concept, I have found many of our students in third, fourth, and fifth grade struggle with this skill.

Things start off nicely at first. Rounding two-digit numbers to the nearest 10 is a skill many of our students pick up readily.

And rounding to the nearest 100 has been historically “easier” for our students. (Is it the same with yours?)

But when asked to round three-digit numbers to the nearest 10, things start to go awry.

Rounding 483 to the nearest hundred? Students will often see it is close to 500 with ease.

But rounding 483 to the nearest ten? I’m often met with “500!” as the answer.

And I know the challenge will only grow as students in fourth grade are asked to round to any place.

For this reason, I like to teach a sequence of lessons for rounding to the nearest 10 and 100…a scaffolded sequence to build confidence and understanding.

I’m sharing the steps we follow (actually, levels!) in case you would like to try the same with your students.

First up, Level A!

Whenever my students are struggling with rounding (especially in fourth and fifth grade) I always begin with rounding two-digit numbers to the nearest 10.

We use a scaffolded set of models: starting with numbers paths, to number lines, and then open number lines.

We represent the numbers we are rounding with place value disks. (We use place value disks for so many concepts…here’s a bit more on introducing them to your students).

And build a solid foundation until students are able to round to the nearest 10 automatically.

I have more details in this post on Rounding to the Nearest 10 with 4 Powerful Teaching Strategies.

And all the hands-on activities we use in this lesson kit.

Once my students are able to round to the nearest 10 with ease, we take on Level B…rounding to the nearest 100.

Again, we use a series of models…from number paths to open number lines:

Until students are able to round instantly, based on place value understanding.

Check out more details in this post: 3 Meaningful Ways to Teach Rounding to the Nearest 100.

And the scaffolded lessons in this kit:

You may have noticed we didn’t quite finish with rounding to the nearest 10, having only worked on two-digit numbers so far.

And this is where it gets really good.

Rounding three-digit numbers to the nearest 10 is usually the most challenging concept within this standard.

For this reason, I teach these lessons in Level C.

By now, students have a strong understanding of rounding to the nearest 10 and 100. And we can use this foundation to help them learn to round this more challenging set of numbers.

This time, we round both two and three-digit numbers to the nearest 10, helping students identify key patterns:

We work on these activities until students are able to round to the nearest 10 with confidence and automaticity…even those three-digit numbers!

And to keep all those rounding to the nearest 10 and 100 skills sharp as we go through the levels, I use these scaffolded rounding worksheets:

And there you have it! A sequence for rounding to the nearest 10 and 100 that has been a HUGE help for my students who need more time to develop this concept.

Have you taught rounding with this sequence before? I would love to hear your thoughts below!