Learning Intention:

Students will be able to add two digit numbers within 20 using different strategies.

Lesson:

1. Introduction (5 minutes): Today, we will be learning to add two digit numbers within 20. Who can tell me a two digit number? [Allow students to answer.] Great! Can anyone tell me what adding two numbers together means? [Allow students to answer.]

2. Guided Practice (15 minutes): We are going to start with an example. Let’s take the numbers 12 and 8. Who can tell me how we can add these two numbers? [Allow students to answer.] Ok, let’s add 12 and 8 together. [Write 12 + 8 on the board.] To do this, we can use the conventional algorithm, we can use a number line, or we can use mental math. Let’s start with the conventional algorithm. [Model how to use the algorithm.]

3. Independent Practice (15 minutes): Now, it’s your turn to practice. [Hand out worksheets with two digit numbers.] Please take a few minutes to practice adding two digit numbers using the conventional algorithm, a number line, and mental math. Once you’re done, share your answers with the person next to you.

4. Conclusion (5 minutes): Now that we have practiced adding two digit numbers, who can tell me how we can use this skill? [Allow students to answer.] Great! Remember to always practice and use different strategies to help understand the concept better.