Round to the Nearest 10 or 100 (419)

Teaching Notes

Emphasize place value to identify the rounding digit and the 'look-at' digit. Guide students to apply the '5 or greater' rule consistently.

Vocabulary

Nearest 10: Closest multiple of 10.

Nearest 100: Closest multiple of 100.

Common Mistakes

• Confusing whether to round to the nearest 10 or 100.
• Forgetting to change trailing digits to zeros after rounding.
• Incorrectly identifying the 'look-at' digit for rounding.

Differentiation

Discussion Questions

• Why do we round numbers in mathematics and real life?
• What is the difference between rounding to the nearest 10 versus 100?
• Which digit helps you decide whether to round a number up or down?
• Can a number be rounded to the same value for both nearest 10 and nearest 100?

Extension Activities

• Round prices to nearest $10.
• Round distances to nearest 100 miles.
• Round time to nearest 10 minutes.

Parent Tip

Ask your child to round numbers you see on signs or in books.

Skill Cluster

Number Sense & Place Value

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• Place Value to Hundreds
• Comparing Numbers

Next Steps

• Rounding to Nearest 1000
• Estimating Sums by Rounding
• Rounding Numbers (nearest 1000)
• Estimate Sums by Rounding
• Place Value to Thousands