Lesson Plan:

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October 8, 2015
Standards
October 8, 2015

## Learning Objectives

Students will be able to add a one-digit number to a two-digit number.

## Lesson

### Introduction (5 minutes)

• Ask two volunteers to come to the front of the classroom.
• Give one student a two-digit number. Give the other student a one digit number. Instruct the students to use base-ten blocks to add their numbers together.
• Have the rest of the class use base-ten blocks to model the addition problem at their desks.
• Ask students to share some information. Great questions include: What is the sum of your addition problem? What strategies did you use to find the sum?
• Tell students that today we're going to add two-digit numbers.

### Explicit Instruction/Teacher Modeling (10 minutes)

• Write the following problem on the board: Tess raked 18 leaves on Monday. She raked 7 leaves on Friday. How many leaves did she rake in all?
• Guide students in using base-ten blocks to show 7 and 18.
• Explain to students that when adding a two-digit number, add the ones first. Then add the tens.
• Ask students how many ones there are total.
• Show students how to make a group of 10 ones, by connecting ten cubes together. Instruct them to trade these ten blocks for 1 ten.
• Discuss the term regrouping. Define regrouping as the process of changing groups of ones into tens to make adding and subtracting easier.
• Once you've made a ten from the ones, count the number of ones that are leftover.
• Ask students how many tens and ones are there now.
• Have students write a number sentence to solve the problem.
• Repeat steps using two different numbers.

### Guided Practice/Interactive Modeling (10 minutes)

• Write the following problems on the board:
``````  27                33                19              24
+  7              +  8              +  3            +  5                        ``````
• Give each student an index card or half-sheet of paper.
• Work through the steps together to complete the problems.
• Remind students that a number line can also be used to help add.

### Independent Working Time (15 minutes)

• Have students complete the problems on the Addition sheet independently.

## Extend

### Differentiation

• Enrichment: Challenge advanced students to complete the problems without manipulatives.
• Support: Encourage struggling students to continue using manipulatives to add, or to draw a picture to demonstrate how they can regroup.

## Review

### Assessment (5 minutes)

• Tell students to turn their index card or half-sheet over, to complete a problem on the back.
• Ask them to find the sum for 17 + 6, and draw or write to explain how they found it.

### Review and Closing (5 minutes)

• Review effective strategies for adding one-digit and two-digit numbers, including the definition for regrouping.