Logarithm Lesson Plan for 12th Grade Students

Topic: Logarithms

Objectives & Outcomes

• By the end of this lesson, you will be able to calculate the logarithm of a given number and use logarithms to solve problems involving exponential relationships.

Materials

• Calculator
• Handouts with examples of logarithms and logarithmic problems

Warm-up

• Ask students if they have heard of logarithms before and if so, what they know about them.
• Write the numbers 1, 10, 100, and 1000 on the board and ask students to write down the corresponding logarithms.
• Ask for volunteers to explain their reasoning for how they arrived at the logarithms.

Direct Instruction

• Define logarithms and explain how they are related to exponents.
• Write the numbers 1, 10, 100, and 1000 on the board again, but this time include the corresponding logarithms next to them.
• Ask students to compare the lengths of the numbers and the corresponding logarithms, and ask them to explain why the logarithms are shorter (i.e. because they are based on a power of 10).
• Write the numbers 1, 10, and 100 on the board, and ask students to calculate the corresponding logarithms.
• Ask students to explain their reasoning for how they arrived at the logarithms.

Guided Practice

• Divide the class into small groups and give each group a set of numbers and logarithms.
• Have the groups work together to identify the numbers and their corresponding logarithms.
• Have each group present their work to the class and have the class confirm the answers.

Independent Practice

• Have students work individually or in pairs to solve problems involving logarithms.
• Ask students to record the steps they take to solve the problems and check their answers with a calculator.
• Encourage students to ask for help if they get stuck.

Closure

• Review the concept of logarithms and how to use a calculator to compute them.
• Ask students to share one thing they learned about logarithms during the lesson.

Assessment

• Observe students during the independent practice activity and provide feedback on their calculators and their presentations.
• Alternatively, have students submit their calculators and presentations for assessment.