# 2nd Grade 2.4A Recall Basic Facts To Add And Subtract Within 20 With Automaticity Lesson Plan

## Topic: Recall basic facts to add and subtract within 20 with automaticity

### Objectives & Outcomes

• Students will be able to recall basic facts to add and subtract within 20 with automaticity.

### Materials

• Numbers up to 20
• Flashcards with basic addition and subtraction facts (e.g. 5+7=12, 3-4=11)

### Warm-up

• Review the numbers up to 20 with the students. Ask them to name each number as you write it on the board.
• Ask the students to recite the addition and subtraction facts up to 5.

### Direct Instruction

• Introduce the concept of addition within 20. Show the students two sets of numbers and ask them to identify the sum.
• Review the addition facts up to 10, asking the students to say the answer out loud as you write it on the board.
• Introduce the concept of subtraction within 20. Show the students two sets of numbers and ask them to identify the difference.
• Review the subtraction facts up to 10, asking the students to say the answer out loud as you write it on the board.

### Guided Practice

• Distribute the worksheets with addition problems to the students.
• Have the students work in pairs to solve the problems. Encourage the students to use the basic addition facts up to 10 and to check their answers using the additive property.
• Have the students work in pairs to solve the worksheet with subtraction problems. Encourage the students to use the basic subtraction facts up to 10 and to check their answers using the additive property.

### Independent Practice

• Have the students work on the activities on the second page of the worksheet to practice their basic addition and subtraction skills. Encourage the students to use the basic addition and subtraction facts up to 10 and to check their answers using the additive property.

### Closure

• Review the main points of the lesson, including the concept of basic addition and subtraction facts, how to use them to add and subtract within 20, and how to check answers using the additive property.
• Ask the students to share any challenges they faced during the lesson and how they were able to overcome them.

### Assessment

• Observe the students during independent practice to assess their understanding of the basic addition and subtraction facts and their ability to use them to add and subtract within 20.
• Collect and review the students' math worksheets to assess their ability to use the additive property to check their answers.