Home/Third Grade Math/Week 1: Place value and rounding/Lesson 4
K-5 friendly lesson
Try one idea, then jump into the activity.These lessons are designed to feel short, friendly, and easy to follow.

Round to the nearest ten or hundred using a number line

A number line helps you see which friendly number is closer. Rounding becomes visual and quick.

Lesson 4

Concept

Rounding on a number line: 1. Mark the two nearest tens or hundreds. 2. Place the number in between. 3. Check which end is closer. Example: Round 67 to nearest ten - Between 60 and 70 - Midpoint is 65 - 67 is closer to 70 So 67 rounds to 70. Example: Round 342 to nearest hundred - Between 300 and 400 - Midpoint is 350 - 342 is closer to 300 So 342 rounds to 300.

Try it

Round using a quick number line sketch: 1. 54 to nearest ten 2. 89 to nearest ten 3. 276 to nearest hundred 4. 651 to nearest hundred 5. 450 to nearest hundred (tie case)