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Lesson: Choosing Strategies to Add Mathematics • 1st Grade

In this lesson, we will learn how to use different strategies to add two numbers with sums up to 20 and choose which strategies are best.

Lesson Plan

Students will be able to

compare and use different mental arithmetic strategies,
select the most appropriate strategy to add two numbers with a sum up to 20 mentally,
apply mental arithmetic strategies to solve addition “story problems”.

Q1:

Calculate .

Q2:

James and Hannah are trying to find .

James uses the fact that and says that .

Hannah uses the fact that and says that .

Who is correct?

Q3:

Think about adding 8 and 7.

One of the equations is WRONG. Which one is it?

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