Free 1st Grade 1.3D Apply Basic Fact Strategies To Add And Subtract Within 20, Including Making 10 And Decomposing A Number Leading To A 10 Lesson Plan

Topic: Addition and Subtraction Within 20

Objectives & Outcomes

• Students will be able to solve addition and subtraction problems within 20, including making 10 and decomposing a number leading to a 10.

Materials

• Whiteboard and markers
• Worksheets with ADDITION and SUBTRACTION problems within 20
• Large number manipulatives (if available)

Warm-up

• Review the meanings of the symbols for addition (+) and subtraction (-).
• Ask students to give examples of addition and subtraction problems they have seen before, and solve them together.

Direct Instruction

• Introduce the concept of making 10 in addition.
• Show students how to make 10 using the symbol for addition (+) and explain how this method works for problems up to 19.
• Introduce the concept of decomposing a number leading to a 10 in subtraction.
• Show students how to use the symbol for subtraction (-) to break a number into parts that add up to 10 and explain how this method works for problems up to 19.
• Review the rules for adding and subtracting within 20, including making 10 and decomposing a number leading to a 10.

Guided Practice

• Give students a set of addition or subtraction problems within 20 and have them work with a partner to solve the problems using the correct method (making 10 or decomposing a number leading to a 10).
• Check their work for accuracy and explain any misunderstandings.

Independent Practice

• Have students work on a set of problems within 20 that require them to use the basic fact strategy that was discussed during the lesson (making 10 or decomposing a number leading to a 10).
• Encourage them to use their understanding of the strategy to solve the problems rather than just adding or subtracting numbers.
• Allow them to work at their own pace and provide support as needed.

Closure

• Review the basic fact strategy and the concept of making 10.
• Ask students to share their thoughts on using the strategy to solve problems.
• Emphasize the importance of understanding the underlying concept behind the strategy in order to use it effectively.

Assessment

• Observe students during independent practice to assess their understanding of the strategy and their ability to use it to solve problems.
• Have students complete a worksheet or task that includes addition and subtraction problems within 20.
• Evaluate the students' work to see if they are able to use the basic fact strategy and make 10 to solve the problems.
• Consider giving a quiz at a later date to see if the students can apply the basic fact strategy and make 10 to solve problems within 20.