Lesson plan

Adding it All Up

In this lesson, students will learn how to add a one-digit number to a two-digit number. This will help students build upon the skills needed for regrouping larger numbers.
Need extra help for EL students? Try the Using Regrouping to Add pre-lesson.
EL Adjustments
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Need extra help for EL students? Try the Using Regrouping to Add pre-lesson.

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

The adjustment to the whole group lesson is a modification to differentiate for children who are English learners.
EL adjustments
(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 vertically, so place values are aligned:
    • 27 + 7 , 33 + 8 , 19 + 3 , 24 + 7
  • 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 worksheet independently.

Enrichment: Challenge advanced students to complete the problems without manipulatives.

Support: Encourage struggling students to continue using manipulatives to add or 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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