🧪 K-12 Math Sims Master Pack — Every Math Simulation (7.RP · 8.F · 8.EE)

Ages 12-14 · Browser-based interactive simulations · No logins, works offline

Every Spark Bench math simulation in one downloadable bundle. Covers Common Core Math Grades 7 and 8 — ratios & proportional relationships (7.RP), functions (8.F), and expressions & equations (8.EE) — with interactive sims for rate comparisons, slope, linear functions, systems of equations, scientific notation, and more. Each sim is a self-contained HTML/JavaScript activity that runs on any device — Chromebook, tablet, laptop — with no installs, no logins, and no ads. Drop into Google Classroom, Schoology, or share the link in a daily slide. Lifetime updates: the same shareable link delivers the latest revision every time. Aligned with 6 NGSS performance expectations. Every sim also works offline — useful for field trips, labs without Wi-Fi, or devices with sketchy internet.

---

🔍 WHAT'S INSIDE

• Rainfall & Reservoir Filling Simulator — A side-view animated dam fills with water as rain falls. Students drag a rainfall slider (0–10 cm) and watch the rese...
• Proportional Graph Builder — Students plot rainfall vs. water accumulation on a coordinate grid and test whether the line passes through the origi...
• Equation Writer: y = kx — Given a data table, students derive the constant of proportionality k and write the equation y = kx, then use it to p...
• Parallel Number Lines Explorer — Two stacked number lines — one for rainfall, one for water — with draggable tick markers that snap to each other, sho...
• Downstream Flood Simulator (Non-Proportional) — A top-down river-valley view where students adjust the dam's release rate and watch downstream flood levels rise unev...
• Rate of Change Investigator — Students select pairs of points from a dataset and the tool calculates the rate of change (Δy/Δx), highlighting wheth...
• 7-Day Dam Management Challenge — A week-long simulation game. Each day, variable rainfall fills the dam. Students decide how much water to release — b...
• Landslide Twist: y = kx + b — A landslide adds a constant blockage to the river. Students explore how adding b to the equation shifts the graph off...
• Proportional vs. Non-Proportional Sorter — A drag-and-drop sorting game where students classify tables, graphs, and equations into 'Proportional' or 'Non-Propor...
• Report to the Town Council — A narrative quiz where students present findings to the town council. Each 'slide' poses a decision based on proporti...
• Dam Challenge Vocabulary Flashcards — Interactive flashcards covering all key terms: proportional, constant of proportionality, slope, y-intercept, unit ra...
• Dam Challenge Exit Tickets — A set of quick exit-ticket questions (one per lesson) that teachers can assign at the end of class to check understan...

---

✨ WHY TEACHERS LOVE THIS

✅ Works offline — every sim is self-contained HTML, no servers, no subscriptions
✅ No student logins — one access code per classroom, not per student
✅ Any device — phones, tablets, Chromebooks, classroom PCs
✅ Always the latest version — the URL serves updated sims automatically
✅ 6 NGSS performance expectations aligned — each sim maps to what it teaches
✅ Printable companion worksheets included with every simulation

---

📐 NGSS STANDARDS

CCSS.7.RP.A.2
Recognize and represent proportional relationships between quantities, including identifying the constant of proportionality.

CCSS.7.RP.A.2a
Decide whether two quantities are in a proportional relationship by testing for equivalent ratios in a table or graphing on a coordinate plane and observing a straight line through the origin.

CCSS.7.RP.A.2c
Represent proportional relationships by equations of the form y = kx.

CCSS.8.EE.B.5
Graph proportional relationships, interpreting the unit rate as the slope of the graph.

CCSS.8.F.A.3
Interpret the equation y = mx + b as defining a linear function whose graph is a straight line; give examples of functions that are not linear.

CCSS.8.F.B.4
Construct a function to model a linear relationship between two quantities; determine the rate of change and initial value.

---

🚀 GETTING STARTED

1. Share this URL in your LMS (Google Classroom, Canvas, Seesaw, etc.):
(URL included in your download)

2. The first time students open the URL on a device, they'll be prompted for a one-time access code.
Your code is printed on the first page of the included PDF.

3. Sims open instantly after that — no student accounts, no passwords.

4. For offline use, open the URL on a computer with internet, use "Save Page As" (or download via your browser), and copy the folder to USB or a school share.

---

📅 SUGGESTED PACING

Day 1: Rainfall & Reservoir Filling Simulator
Day 2: Proportional Graph Builder
Day 3: Equation Writer: y = kx
Day 4: Parallel Number Lines Explorer
Day 5: Downstream Flood Simulator (Non-Proportional)
Day 6: Rate of Change Investigator
Day 7: 7-Day Dam Management Challenge
Day 8: Landslide Twist: y = kx + b
Day 9: Proportional vs. Non-Proportional Sorter
Day 10: Report to the Town Council
Day 11+: Use remaining 2 simulations for differentiation, review, or assessment

---

🤝 FAIR USE

Please do: Share the URL and access code with your students. Use the same code on every classroom device. Re-use the bundle year after year.

Please don't: Post the access code publicly (social media, forums) or send it to teachers at other schools. Each code has an activity cap — if it's shared widely it can stop working for everyone using it, including you. Other teachers should grab their own copy so yours keeps working.

---

💬 QUESTIONS OR FEEDBACK

Have a feature request, found a bug, or want to suggest a new simulation? Reply to your TpT order, or visit sparkbench.app to see what else is coming.

Thanks for supporting independent classroom resources. 🙏