Rounding to the Nearest Hundred Using a Number Line

This lesson teaches how to round numbers to the nearest 100 using a number line. It explains benchmark numbers, midpoints, and common mistakes in rounding. The lesson provides examples to illustrate the concepts and concludes with a summary of the key points.

What are benchmark numbers used for in rounding?

• To calculate the exact value of a number

• To determine the range a number falls within

• To identify the closest whole number

• To find the midpoint of a number line

What is a common mistake students make when using a number line for rounding?

• Counting by tens instead of hundreds

• Rounding numbers without a number line

• Assuming increments always count by ones

• Ignoring the benchmark numbers

How do you determine whether to round up or down using a midpoint?

• Round up if the number is less than the midpoint

• Round down if the number is equal to the midpoint

• Round down if the number is greater than the midpoint

• Round up if the number is equal to or greater than the midpoint

If a number is 349, what is the nearest hundred it rounds to?

• 300

• 350

• 400

• 500

When rounding 1,472 to the nearest hundred, what is the result?

• 1,400

• 1,450

• 1,600

• 1,500