Lesson 6: Linking Addition and Subtraction

 Lesson Plan

Tuning In

• Watch the Addition and Subtraction Fact Families video on YouTube. After watching, ask the students whether they have noticed this link between addition and subtraction before and when this idea might be helpful.

Teacher Instruction

• Display the Addition and Subtraction Fact Families – Teaching Presentation. Step through the slides, working through the examples with the students and completing the activities. Highlight the relationship between addition and subtraction.
• Explain to the students that an addition number sentence has a family of related number sentences, some involving subtraction. Ensure that students understand that to determine whether three numbers are part of a fact family, the two smaller numbers must be added together to find the total. If the total equals the third number, these numbers are a part of a fact family.

Guided/Independent Learning

• Split the class into to two groups. Provide one group with copies of the Fact Family Rocket Blast Off activity, and distribute the Linking Addition and Subtraction Worksheet to the other.
• Monitor and support the students as they complete the tasks. After an allotted time, groups swap and commence working on the other activity.

Wrapping Up

• Revise the two activities and discuss the answers. Ensure that students have recorded the correct answers on the worksheets, making corrections where needed.
• Ask students to share, in their own words, the relationship between addition and subtraction.
• Complete Suspect Investigation 6 in the Addition Detectives – Teaching Presentation.
• Reveal the next suspect and place them on the board.

 Differentiation

Extending Students

• Extend students by encouraging them to use the equals sign to indicate equivalence, e.g. 6 + 7 = 13 is the same as 13 = 6 + 7.

Supporting Students

• Allow less-confident students to use concrete materials in place of the number sentences.
• Provide students who require assistance with an alternate version of Fact Family Blast Off that uses smaller numbers.

 Assessment Strategies

Suggested Assessment Strategies

• used strategic whole class or individual questioning
• observed student participation during learning activities
• recorded student progress on a checklist
• annotated student work samples
• collected and reviewed student work samples
• facilitated whole class or peer feedback sessions
• encouraged student self-reflection
• administered formal assessment tasks.

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