# Patterns in Subtraction Sub Plan

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## Objective

SWBAT compare equivalent addition and subtraction problems by listing similarities and differences in the equations, solutions, number lines, and context.

#### Big Idea

Students will begin to see the connection between subtraction and adding the opposite.

## Intro & Rationale

I like to have students take assessments with my sub because testing days don't require a lot of teaching. This quiz is checking that the students are understanding how to add integers. Some students may be modeling with number lines or symbols while others may be comfortable solving them mentally after having learned patterns. When I get back I will be looking for some common mistakes which are finding the difference when integers with the same sign are being added or adding the integers when positives are being added to negatives.

The homework asks students to compare and contrast a subtraction problem and it's equivalent addition problem so they can begin to recognize the pattern. The homework relates the problems to the context of hot and cold cubes learned in earlier lessons (Mathmaster Chef series). The context helps them model the problem mathematically and helps them to recognize the relationships between the operations and use them to find a pattern. (mp7)

15 minutes