Welcome to "Donut Rate Plotter", a 6th Grade Variables mission at the Seedling (entry-level) level, staged in our bakery scenario. The mission opens with a hands-on prompt: "If a candy costs c dollars, the total cost 2c means 2 groups of c. Build it: place 2 x-tiles to represent 2 candies." You'll reason about the numbers 2, 7 across 3 guided steps.
Behind the bakery story, this lesson is really about variables aligned to CCSS 6.EE.B.6. Use variables to represent numbers and write expressions when solving real-world problems. The key strategy this mission asks you to internalise: Answer: 14.
A general pattern to watch for in 6th Grade variables — illustrated with example numbers below, which may differ from this lesson's: Translating "less than" in the wrong order. "5 less than n" = n - 5, NOT 5 - n. If you get stuck on "Donut Rate Plotter", the adaptive Socratic hints below escalate from a gentle nudge to a worked-out strategy — the same way a one-on-one tutor would coach you through it.
Grade 6 · Variables
Mission Progress
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Thinking Summary · 1
Mastered[object Object]
[Discovery] If a candy costs c dollars, the total cost 2c means 2 groups of c. Build it: place 2 x-tiles to represent 2 candies.
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Active StepBuild 2x using x-tiles and 1-tiles.
Everything you need to know about the Socratic experience.
If a candy costs c dollars, the total cost 2c means 2 groups of c. Build it: place 2 x-tiles to represent 2 candies. Hint: Each x-tile stands for one c (one candy). The coefficient counts how many.
What does the variable c represent in this story? If you get stuck, the adaptive hint is: price
Seedling missions anchor the visual model with small, friendly numbers — ideal as the first attempt at this topic. Within 6th Grade Variables, expect numbers in the corresponding range.
Confusing "twice a number" with "two more than a number". "Twice" = ×2. "Two more" = +2. Different operations.
Expressions (Variables are the substance of expressions.). Open /grade-6/expressions to start that topic's missions.
Inquiry-based learning starts with a question, not a formula — students explore, hypothesize, and verify before being told the rule. In Inquiry AI, every mission opens with a "Discovery" step (manipulate the model), then "Abstraction" (write the equation), then "Reflect" (apply to a new case). The procedure is never given upfront; learners derive it from their own observations.
Pure discovery is inefficient — kids hit a wall and quit. Guided Discovery scaffolds the path: a careful sequence of questions, models, and adaptive hints leads the learner toward the insight without revealing it. Inquiry AI's hint system fires automatically after ~15s of hesitation or on the first mistake, escalating from a Socratic nudge to a worked example only when needed. Mistakes are diagnosed via "misconception keys" so the hint matches the actual wrong-thinking pattern.
