October 8, 2015
by Yolanda Swain
Lesson Plan:

Adding it All Up

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

(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.
(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.
(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.
(15 minutes)
  • Have students complete the problems on the Addition sheet independently.
  • 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.
(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.
(5 minutes)
  • Review effective strategies for adding one-digit and two-digit numbers, including the definition for regrouping.

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