Lesson Plan:
Adding it All Up
October 8, 2015
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?
- Ask students to read the problem aloud with you.
- 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.
Guided Lessons are a sequence of interactive digital games, worksheets, and other activities
that guide learners through different concepts and skills.
They keep track of your progress and help you study smarter, step by step.
Guided Lessons are digital games and exercises that keep track of your progress and help you study smarter, step by step.
First grade mathematicians will be working this year on number sense in order to improve their understanding of the relationship between numbers and their ability to do mental math. This guided lesson will help strengthen this important skill with targeted instruction and plenty of real-world practice problems. Once the lesson is finished, you can extend learning with the suggested number sense worksheets.
First grade mathematicians will be working this year on number sense in order to improve their understanding of the relationship between numbers and their ability to do mental math.
This lesson includes printable activities:
Download All (5)
Song: Counting by 5 Song
Game: Skip Counting Game Show
Game: Speed Counting 20 to 40
Game: Counting Restaurant Orders
Story: Too Many Muggos
Game: Speed Counting 100 to 120
