Lesson 2: Linear Logic—Addition & Subtraction
Duration of Days: 4
Lesson Objective
SWBAT: Calculate missing "step" dimensions on a part drawing by subtracting feature lengths from the overall length.
Determine raw material requirements by adding the "finished length" to the "kerf" (saw blade width).
How can we find a measurement that isn't explicitly written on the page?
What happens to our part if we forget to account for the width of the saw blade (kerf)?
Sum, difference, overall dimension, step dimension, kerf, bar stock, scrap, and operation.
CTE.MFG.B.05 (Basic operations)
CCSS.Math.6.NS.B.3 (Decimal fluency).
DOK Level: 2 (Application).
Students apply arithmetic to calculate "stack-up" dimensions. This teaches students how to find missing dimensions and account for material loss during cutting
Support: Use "TouchMath" or number lines for students struggling with basic fluency.
Extension: Introduce "Tolerance Stack-up"—if three parts are all 0.002 too long, how much longer is the total assembly?
"The Step-Shaft Challenge." A worksheet featuring a drawing of a shaft with 5 "steps." Students must calculate the missing length of the middle step.