Master middle-school geometry through 20 bite-sized, interactive Scratch games. You’ll classify and compute angles, solve segment puzzles, read and compare slopes, construct lines on a grid, and explore 3D solids with surface area and volume—always with instant feedback and clear visuals. Each lesson is self-contained, quick to play, and classroom-ready, building procedural fluency and geometric reasoning step by step. Perfect for grades 6–9, laptops or Chromebooks, no prior Scratch experience required.
Welcome to Scratch Mathematics – 12! This set focuses on angles, lines, slopes, 3D solids, and coordinate constructions—each as a bite‑sized, interactive Scratch game.
Lesson 221 – Name That Angle
Decide if a single angle is acute, right, obtuse, straight, or reflex.
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Lesson 222 – Angle Add‑Up
Find the missing measure using 90° (complementary), 180° (linear/supplementary), and 360° around a point.
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Lesson 223 – Algebra Angles
Turn simple angle pairs (vertical/linear) into one‑step equations and solve for x.
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Lesson 224 – Angle Relationships
Slideshow tutorial of the big nine: corresponding, alternate interior/exterior, co‑interior (F/Z/U), adjacent, complementary, supplementary, linear pair, vertical.
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Lesson 225 – Angle Allies
Multiple‑choice quiz: name the relationship between a and b with 7 buttons and instant feedback.
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Lesson 226 – Angle Detective
Enter the measure of angle b from a diagram; Submit/New flow with a 60‑puzzle bank and Tera’s feedback.
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Lesson 227 – Angle Equation
Use geometry clues (including parallel‑line relationships) to build an equation and solve for x.
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Lesson 228 – The Line Puzzle
On a line with points A–B–C–D, use three given distances to find the missing segment.
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Lesson 229 – Line Mystery
Build a line through points A–B–C–D and use the segment identities to find the single hidden measure. One unknown, six monitors—deduce the missing value.
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Lesson 230 – Line Mystery 2
Each round shows three clues as equations in x, one numeric value, and two hidden segments. Use all three equations together to pin down x and validate the line.
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Lesson 231 – Line Mastery
Pick one of 15 tests (30 questions each) and race through classic A–B–C–D segment problems. Timed scoring with instant checks on AC, BD, AD, and the basic segments.
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Lesson 232 – Equal Halves
Point B is the midpoint of AC, so AB=BC. Both halves are shown as linear expressions in x; solve for x and report the common length.
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Lesson 233 – Midpoint Balance
Given two endpoints on a coordinate grid, compute the midpoint. Fast rounds with clear visual feedback.
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Lesson 234 – Midpoint Mirror
Given one endpoint and the midpoint, find the missing endpoint by reflection. Enter the coordinates and check your result.
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Lesson 235 – Grid Triangles
A triangle with a horizontal/vertical base is drawn on the grid. Press Solve to reveal the three side lengths, the perimeter, and the area (via base×height/2).
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Lesson 236 – Rope Runner
Four shapes share the stage: right triangle, rectangle, square, and circle. Using the given measures, compare perimeters/circumference; Solve reveals the winner that “uses the most rope.”
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Lesson 237 – 3D Figures
Slideshow tutorial: solids, polyhedra, prisms, pyramids, Platonic solids, plus surface area and volume—examples included.
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Lesson 238 – Rise & Run
Look at the line and tell its slope. Enter a decimal rounded to the nearest hundredth; instant feedback and new lines.
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Lesson 239 – Parallel or Perp?
Compare two lines from coordinates A–B and C–D. Click Parallel, Perpendicular, or Neither; slopes are revealed with feedback.
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Lesson 240 – Graph the Perpendicular
On a −9…9 grid, move point Q from P to make PQ ⟂ JK, then press Space to check. Any lattice point on the perpendicular counts.
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