Real-life Systems 4 - Sum Plus One Other

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SWBAT solve systems of equations modeling real-life situations (Day 4 of 5)

Big Idea

Get deep into algebraic thinking by solving problems that aren't so straightforward including a tricky one that pushes kids to think algebraically.


10 minutes

Each day, students complete a Warm-up that usually consists of spiraling the previous day's material, in addition to older material.  Warm-up problems also sometimes extend lessons that students have encountered before to more unfamiliar contexts.

For a video narrative about how I structure each lesson, and how the warm-up fits in, click here.

Play of the Day

40 minutes


10 minutes


15 minutes

The homework file is a resource that generally includes 5-7 problems that consist of problems related to this lesson, as well as spiraled review.  I also give the kids the answers to the problems. 

Sometimes, the HW file is a take-home assessment.