Round to the Nearest 100 (3-Digit Numbers)

Teaching Notes

Emphasize focusing on the tens digit to decide whether to round up or down. Use a number line to visualize how numbers fall between hundreds.

Vocabulary

Round: To estimate a number to a certain place value.

Nearest Hundred: Closest multiple of 100.

Common Mistakes

• Looking at the hundreds digit instead of the tens digit.
• Rounding down when the tens digit is 5.
• Incorrectly identifying the 'nearest' hundred (e.g., 349 to 400).

Differentiation

Discussion Questions

• How does the tens digit help us decide whether to round up or down?
• When might you use rounding to the nearest hundred in everyday life?
• Can two different 3-digit numbers round to the same hundred? Give an example.
• If a number has 0 in the tens place, what happens when you round to the nearest hundred?

Extension Activities

• Round numbers on a clock.
• Round distances on a map.
• Round heights of friends.

Parent Tip

Ask your child to round prices of items at the grocery store.

Skill Cluster

Number Sense & Operations

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• Place Value to Hundreds
• Comparing Numbers

Next Steps

• Rounding to Nearest Ten
• Rounding 4-Digit Numbers
• Round 2-Digit Numbers to Nearest Ten
• Round 4-Digit Numbers to Nearest Hundred
• Estimate Sums by Rounding