3rd Grade Place Value, Addition And Subtraction Using Long Method Lesson Plan Example (Math)

Topic: Place value, addition and subtraction using long method

Students will be able to add and subtract numbers using the long method.
Students will be able to understand the place value system and its relationships with other place values.

Review the concept of place value with the students by using the numbers 21, 42 and 73. Ask the students to explain how each number is made up of smaller parts called digits.
Next, ask the students to put the numbers in order from smallest to largest. Typically, the students will put 21, then 42, then 73.

Introduce the long method for addition using place value. Explain that the first step is to add the digits in the ones place. For example, to add 7 + 3, we add 1 + 3 = 4.
Next, we add the digits in the tens place. 7 + 3 = 10, so we add 0 to 4 to get 4 0.
Finally, we add the digits in the hundreds place. 7 + 3 = 10, so we add 0 to 4 0 to get 4 0 0. The total is 41.
Repeat this process for addition problems with numbers with more than one digit in the ones place, such as 22 + 12.

Have students work in pairs to complete a set of addition problems using the long method. Provide assistance as needed.
As a class, go over the answers to check for understanding.

Have students work on a set of addition problems using the long method. Encourage them to use their scratch paper and mental math skills to solve the problems.
As a class, go over the answers to check for understanding.

Observe students during independent practice to make sure they are using the long addition method correctly.
Collect and review their completed place value worksheets to assess their understanding of place value and their ability to perform long addition.

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