Fifth Grade · Math · week 26

Recipe-scaling project

Apply fraction multiplication to scale a recipe up or down, combining several ingredient conversions in one project.

Scaling a recipe means multiplying every ingredient by the same scale factor. Doubling a recipe multiplies every amount by 2; making a half batch multiplies every amount by 1/2.

Scale factors do not have to be whole numbers -- making 1 1/2 times a recipe multiplies every ingredient by 3/2, mixing fraction and mixed-number multiplication into one real project.

📋 For the teacher
Teach it (10–15 min):
  • Make this a real, or pretend, kitchen project: pick an actual recipe with three or four ingredients and scale the whole thing together.
  • Identify the scale factor first, as a single fraction or mixed number, before touching any ingredient amount.
  • Apply that SAME scale factor to every single ingredient -- a common mistake is scaling only some of them.
  • Convert any awkward improper fraction result back into a mixed number or a friendly measuring amount at the end.
Talk about it:
  • What is the scale factor when you double a recipe? When you make a half batch?
  • Why must every ingredient be multiplied by the same scale factor?
  • Which ingredient amount was trickiest to scale this week, and why?

Mastery looks like: They can identify a recipe scale factor and correctly multiply every ingredient by it, including fraction and mixed-number factors.

Common stumbles: Scaling only some ingredients and not others; mixing up which number is the scale factor versus the original amount.

See it visually

Interactive, spoken-aloud tools that show this idea in motion.

FractionsSlice bars and circles into equal parts and compare them.try →MultiplicationEqual groups and arrays make products finally click.try →
Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
Records attendance + 15 min of Math for this learner.
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