# Lesson: Regrouping to Estimate: Sum or Difference

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### Lesson Objective

SWBAT use regrouping to round whole numbers up to the ten thousand to compute the sum.

### Lesson Plan

Materials Needed: DN worksheet, dry erase markers, white board, blank paper, pencils, Example Chart
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Do Now (3 -5 min): Teacher gives each student a DN worksheet and asks them to complete the work as quickly and quietly as possible.

Opening (2 -3 min): Teacher quickly reviews answers to the Do Now and then says, “Yesterday we practiced using front end rounding with numbers that have decimals. Today, we are going to learn a new skill. By the end of the lesson, you will be able to use regrouping in order to round whole numbers up to the ten thousand place in order to compute a sums and differences.”

Direct Instruction (10 min): The teacher will be teaching regrouping to the students. The teacher should write the following rules on the board.

1. Draw lines to separate the 1s, 10s, 100s, and 1000s place.
2. Add the numbers in each column. Write each sum in its column
3. If there are 2 digits in the 1s place, trade 10 ones for 1 ten.

4. If there are 2 digits in the 10s place, trade 10 tens for 1 hundred.
5. If there are 2 digits in the 100s place, trade 10 hundreds for 1 thousand.
6. If there are 2 digits in the 1000s place, trade 10 thousands for 1 ten thousand.

After the teacher reviews the method in which everyone will be adding today. The teacher writes an example on the board/chart based on the Examples Chart. Teacher says, “Let me show you an example of how to use these steps.

Guided Practice (8-10 min): Teacher says, “Now, I will give you six problems to do together in groups of 2 or 3 on your own paper. Help each other as you work, because in a minute I will have you do some problems on your own. Let’s get started.” Teacher writes the problems on the board according to the problems listed in the Example Chart.

Independent Practice (10 min): The teacher reviews the answers to the Guided Practice with the class and then has the students complete the problems from the Example Chart on their own using their own paper.

Closing (2-3 min): Teacher calls the attention of the students back toward the front of the class to quickly review the answers to the Independent Practice/ ask what we learned about.

### Lesson Resources

 Ex Lesson 6   Exemplar 1 DN lesson 6 estimation   Starter / Do Now 1