Title

Addition- There’s More than One Way

Lesson Objective

Students will learn how to add two digit numbers.

Background Information for Teacher

There are many different inventive strategies for addition, but in this lesson we will discuss two different ways that

students often use to solve problems.

Materials:

● Whiteboard

● Markers

● Paper

● Pencil

Step 2: Teach Lesson

Write the following story problem on the board and ask the student to solve the problem using any other method that they

choose. Problem:

Chelsea bought 16 pieces of bubblegum and 9 jawbreakers at the store. How many pieces of candy

did she have altogether?

After the student had an opportunity to solve the problem using their manipulatives, ask the student to share how they

solved the problem. Write the steps on the board as students explain their methods.

Explain to the student that there are many methods to solving an addition problem. One strategy is the “Expanded Form.”

The student write the numbers in expanded form first and then add the different place values. The answers from each of

the places are then added together. Watch Video 1 in Step 1

Example:

Tens Ones

36

→

30

+ 6

80

+ 57

→

50

+ 7

+ 13

80

13

93

Another strategy is “Carry Over Form”. The student adds each number in the place value column and carry’s over the

reminder. Watch Video 2 in Step 1

Example:

1

36

+ 57

93

Write 6 double digit math problems on the board or a piece of paper and have the student solve half of the problems using

the expanded form and the other half using the carry over form. Observe the student. After the student has correct solved

all 6 problems ask the student which method they prefer and why.

Step 3: Complete the worksheet attached below.

Worksheets for extra practice

Worksheets for extra practice

Step 4: Review. Start the next lesson with the game or activity attached below for review so the student can

demonstrate understanding of this lesson before moving forward.

Addition Mania (online) game