Lesson 3: Global Systems—Decimals & Metric
Duration of Days: 3
Lesson Objective
SWBAT: Convert metric drawing dimensions to inches using the 25.4 conversion factor.
Perform addition and subtraction of decimal values to calculate machine "offsets."
What are the real-world consequences of a conversion error? (e.g., the Mars Climate Orbiter).
Why is the metric system easier for "scaling" production up and down?
Metric system, SI system, millimeter, micron, conversion factor, decimal place value, hundredth, thousandth
CTE.MFG.B.08 (Unit conversion)
CCSS.Math.6.RP.A.3.D (Ratio reasoning).
Conversion between Metric and Customary systems. Prepares students for a global supply chain where blueprints may use either system.
DOK Level: 2 (Application)
Support: Provide a "Conversion Slider" visual tool to help students move decimal points in the correct direction.
Extension: Practice "Nearer Fractional Equivalents"—find the closest fraction drill bit for a 12.5mm hole.
"The Global Order" – A worksheet requiring the conversion of a complete metric parts list into fractional equivalents.