Most of us default to the old procedure we were taught: underline the place you’re rounding to (say, the 10s place), look at the digit next door—5 or higher, round up; 4 or lower, round down—and don’t forget to add zeros and leave the rest of the number the same. Crystal clear… right?
For many students, this method encourages memorization, not understanding. I remember visiting a third-grade classroom where students were learning rounding at a Math with the Teacher station. With the teacher guiding them, everything seemed fine—but back at their desks, students struggled to apply the skill independently.
Some students can use a number line, plot the two closest endpoints, find the midpoint, and decide which way to round. But not every child has the number sense to do that confidently.
Enter the abacus.

I grabbed an abacus (still shrink-wrapped in the back of the classroom!) and worked with a student on rounding 156 to the nearest 10. Using a single abacus to represent 50–60, I asked, “Would it be quicker to push all 6 beads back to 50, or just push 4 beads forward to 60?” He immediately recognized that rounding up was faster—and just like that, he understood why 156 rounds to 160.
A few guided problems later, he was able to use the abacus independently and explain his reasoning. His response?
"Is that what they were trying to explain with the five-and-higher, four-and-lower rule?? This way is way easier, Miss Shannon!"
Some kids can’t visualize rounding abstractly or on a number line—they need a concrete tool like an abacus to make their thinking visible. And students who already grasp rounding still benefit from articulating why they make the decisions they do.
Using Number Lines and Abaci in Practice
Our PowerPoint presentations and video tutorials cover rounding from nearest 10 to nearest 1000 (and even decimals!). Both the abacus and number line are included as visual tools to help students see and understand rounding.
With a number line, students plot the endpoints, find the midpoint, and then see which endpoint their number is closer to. The abacus can also represent this, giving students a concrete way to compare numbers.
Rounding with Decimals
Decimals can be even trickier. For example, rounding 5.26 to the nearest tenth requires understanding that 5.2 and 5.3 are the endpoints and 5.25 is the midpoint. Using place value discs—or a modified abacus where each bead represents a tenth or a hundredth—helps students see the numbers and make informed rounding decisions.
Make It Concrete
Place value is abstract, and rounding often requires more repetition than a typical math book allows. These tutorial videos make concepts tangible and help students connect rounding to higher-level skills like estimation.
Try a quick rounding exercise as a warm-up—even virtually! Have students plot points on a number line in a Google Doc or Slide, or record a Flip Grid video explaining their rounding choices. Emphasize explaining their thinking—often more important than getting the right answer.
Check out our Place Value: Rounding series (M³ Members can download it for free!) and see how the videos can help students—and even parents—understand rounding.
How is rounding going for you? Leave a comment or question—we’d love to hear from you!












