Rounding Neighborhood

Move a visitor between benchmark homes and compare distances for rounding.

Grades 3–5 · Math

Your goal

Move the visitor to 37 and compare its distances to the nearest 10 homes. A midpoint tie goes to the larger home.

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Reduced motion is on. The controls still update the scene.

27 is 7 from 20 and 3 from 30. Rounded to the nearest 10, it becomes 30. The closer home is highlighted.

Visitor number

All numbers here are nonnegative integers. A midpoint rounds up to the larger benchmark. The neighborhood follows the visitor while keeping equal spacing between consecutive benchmarks.

Learn with Rounding Neighborhood

Rounding Neighborhood shows rounding as a comparison of distances rather than an isolated digit rule. Move a numbered visitor between two benchmark homes and watch the nearer home become highlighted. The midpoint divides the interval, and the feedback states both distances and the rounded result. Nine goals use nearest tens and nearest hundreds, including exact midpoint cases. Upper elementary learners can explore neighboring values with the controls, visit a midpoint directly, and explain why a small change near a boundary can change the rounding destination.

What to look for

Compare distances

The closer benchmark gives the rounded number.

Find halfway

The dashed midpoint is equally far from both homes.

State the tie rule

For these nonnegative numbers, halfway goes to the larger benchmark.

For teachers and curious learners

Explain rounding by comparing distances to adjacent benchmarks. Ask students to predict what will happen, change one setting, and explain what they observe. Learn gives a starting point. Practice and Challenge offer new goals with the same scene.

An exact nonnegative integer model from 0 to 999, rounding to tens or hundreds. Midpoint ties round upward. Adjacent homes follow the visitor, and a displayed benchmark can be 1000.

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Rounding Neighborhood