Double or halve a recipe and verify each quantity
Goal
Calculate a scale factor as desired servings ÷ original servings, multiply every ingredient by the same factor, express a practical amount with its unit, and keep cooking time as a separate decision.
Prerequisites (quick check in lesson)
- Visual fraction grouping
- Doubling means two equal groups
Materials
- Paper and pencil
- The practice card below
- Optional: measuring cups and water only for a demonstration
Time
- Teaching segments (planned video 5.5 min)
- Readable and illustrated now · video in production — not yet available
- Your hands-on practice
- 10–15 minutes, at your pace
Supervision and boundaries
Learners ready for fractions. Younger learners can begin with doubling whole-number measures.
Scope: Planning quantities on paper, with an optional water-and-measuring-cup demonstration. This starter assesses half, one-and-one-half and double batches.
Not covered: Cooking, knives, food storage, or eating practice ingredients; Altering tested canning/preservation formulas; Medication doses; Infant formula; Household chemicals.
Ordinary practice: A routine task or tabletop exercise. Still adapt tools, materials, accessibility, and supervision to the learner.
Ways to learn it (switch any time)
- Show me
Precise diagrams - Talk me through it
Authored dialogue prompts - Let me try
Action and practice - Step by step
Small numbered steps - Read it
Illustrated text
Optional read-aloud uses your device's voice on authored text.