Mixed Rounding (10, 100, 1,000, 10,000) (738)

Teaching Notes

Have students annotate which place to round to before deciding. Mix in boundary cases (5s).

Vocabulary

Mixed Rounding: Rounding to different place values.

Precision: The exactness of a number.

Common Mistakes

• Rounding to the wrong place
• Using the wrong digit to decide
• Incorrectly identifying the rounding digit
• Failing to change trailing digits to zero
• Rounding down when the digit is 5 or more
• Misidentifying the digit to the right

Differentiation

Discussion Questions

• How does the target place change your decision?
• Why do 5s always go up?
• When is rounding useful in everyday situations?
• How does knowing place value help with rounding?
• Why do we replace digits to the right with zeros?
• Can two numbers round to the same value?

Extension Activities

• Estimate sums/differences with mixed rounding
• Create a number that rounds differently at different places

Parent Tip

Give your child numbers and ask them to round to various place values.

Skill Cluster

Number Sense

Estimated Time

12 minutes

Skills Practiced

Prerequisites

• 719
• Understanding Place Value
• Comparing Whole Numbers

Next Steps

• Estimating Sums and Differences
• Rounding Decimals
• Rounding to the Nearest 100,000
• Estimating Products by Rounding
• Rounding with Large Numbers