Every part, two ways
Each part of the bundle opens right here on the site, projectable in any browser, and downloads as an editable file, never a locked PDF. Adapt them to your set, your timing and your school's calendar.
Lesson plan
The 45-minute plan, with the measure many, then divide model, the predict hook, examiner traps and a timing and contingency note.
Worksheet and answers
Six original Core questions, with diagrams to read, and a full worked answer key with marking notes.
Slides
Your actual slides, presented right in the browser, with the live simulation linked beneath; the download is fully editable.
21st century skills activity
Numbered Heads Together with four challenge cards and the pendulum results sheet, with a full facilitation guide so it runs faithfully.
Send learners to the lesson online
This bundle pairs with the student topic page Measuring length, volume and time, whose "measure many, then divide" section carries the interactive explanation, and with the site simulation The Multiple Measurement Method, which applies the same method to length, volume and time.
One rule, made to stick
The lesson opens with a failure: timing a single swing by hand is hopeless, because reaction time is a large part of one short reading. From there it builds one rule, measure many then divide, and shows why it works: the start-and-stop error is about the same whether you time one swing or twenty, so dividing the total by the count shares it out.
Numbered Heads Together makes learners argue out a method for several small quantities, and the pendulum practical lets them feel the difference. The activity ships with a full facilitation guide, and random call after the discussion keeps every learner accountable for the reasoning, not just the arithmetic.