Unit 3, Lesson 16
Round and Round Again
Grade 3
Preparation
Lesson Narrative
Students deepen their understanding of rounding to go beyond accurately rounding individual numbers as they think about what numbers round to a given number. Working backward from a multiple of 10 or a multiple of 100 allows students to think about the relative distances of numbers and the range of numbers that round to the given multiple of 10 or a multiple of 100. Students then use this understanding to write clues to help their classmates guess a mystery number. The rounded number becomes a useful way to describe the mystery number in this game.
This lesson has a Student Section Summary.
- Action and Expression
- MLR8
- Describe (orally) a three-digit number including details based on rounding to the nearest ten or hundred.
- Determine (in writing) all the numbers that can round to a given multiple of 10 or multiple of 100, and describe (orally) observed patterns.
- Let’s look for patterns in rounding.
Required Materials
Activity 2
Required Preparation
- Each student needs an index card.
Teacher Reflection Questions
What was the best question you asked students today? Why would you consider it the best question, based on what students said or did?