Build Mini Golf with geometryUse everyday materials and geometry shapes and angles to show and practice how to get a hole in one when playing Putt Putt miniature golf.

3D Math gyrosMake your own mathematical gryo/gimbals by using Tinkercad Community Shapes
http://www.thingiverse.com/thing:431348 
build a boxBuild an open top box to store cubes.
What questions do you have? How many cubes will the box hold? How many different boxes can you build? Which one holds more cubes? From:101qs.com http://www.101qs.com/3256
Grades: 35

Robot basketballBuild a robot arm that can shoot three baskets in a row.
Using math & geometry, learn about angles and degrees: http://www.wikihow.com/ApplyMathandGeometryinBasketball Using Cardboard: http://www.instructables.com/id/MechatronicBasketballShooter/step2/TheArmCardboardVersion/ 
Calculating surface areaWord problem: Find the surface area of the rectangular solid. Use a NET and 3D solid. *print paper net and build 3D rectangle *Create the 3D shape and/or a net using CAD program like 123D Design *use 3D printer to print object and then measure for surface area. Nets for downland/print: http://www.senteacher.org/worksheet/12/NetsPolyhedra.html From ISTE: https://www.iste.org/explore/articleDetail?articleid=283& Grade 5 

Geometry Mini Golf Putt Putt ProjectBrookline High School Putt Putt project:
http://resources21.org/cl/contextual.asp?projectnumber=499.768%20%20 Grades: K12

Furniture in Cardboard
chair  cardboardUse measurement and template to build a cardboard chair.
Instructions: http://www.instructables.com/id/CardboardChair/ Grades: 712

table cardboardDesign, measure and build cardboard furniture.
Grades: 712

Ratio & working GearsSimple ratio lesson & exercises with gears
http://www.thingiverse.com/thing:185912 Grades: 68

Grades: 15
Math spinner 
Lego's & Math
Curriculum ideas: Math, writing and more.
http://www.teachingideas.co.uk/maths/waystouselegointheclassroom_
Grades: K3

GEODESIC: Using straws and strawbee connectors, build a geodesic globe shape.
Instructable Instructions: http://goo.gl/Lq5gz1 DODECAHEDRON: Using straws and strawbee connectors, build a dodecahedron. Instructable Instructions: http://goo.gl/YvoZ8U Grades: 610

Skewer HyperboleHow can straight skewers curve? Find out.
Build a hyperboloid with skewers and rubberbands. It will naturally form a curve and fall into a circular crosssection. Write an instructional technical guide to help others make this project. More: http://www.georgehart.com/skewers/skewerhyperboloid.html This hyperboloid has n=16 and 11 rows of rubber bands. So there are 32 skewers and 176 rubber bands.
Grades: 912

fractals
Using Scratch, build your own fractal. Learn the program, and modify it to make it better.
Scratch: https://scratch.mit.edu/projects/1360458/#editor Fractal Program 2: https://scratch.mit.edu/projects/96117364/ 
Build your own fractal: https://www.scds.org/ftpimages/70/download/DirectionstoMakeaFractal.pdf
Grades: 48

Shapes with ScratchLesson: Build Shapes with proportion, scalability on x,y chart using scratch:
https://www.citizenmaths.com/howtousescratchincitizenmaths/ Grades: 38

Use scratch to teach Cartesian (X,Y) coordinates.
Tutorial: https://scratch.mit.edu/projects/11656419/ Grades: 410

X,Y Coordinates with codingGrade 6 Lesson: https://goo.gl/oZ5gWJ
Lesson 1 & 2, X Y Coordinates and movement
https://kanplan.wordpress.com/2014/03/30/teachingprogrammingtokidswithscratchlesson2/ Lesson 3 Movement: http://iwant2study.org/scratch/?p=107
Challenge: https://scratch.mit.edu/projects/19771430/https://scratch.mit.edu/projects/19771430/
Drawing shapes using X,Y coordinates: https://scratch.mit.edu/studios/74760/
Math learned through scratch: Cartesian coordinates, negative numbers, degrees of turn, and decimals.
HTTP://WWW.FRACTUSLEARNING.COM/2016/02/03/MATHSWITHSCRATCH/ 
Dilation  Geometry + transformationDilation is a very useful transformation for creating the appearance of hearts that are growing larger. Dilation changes the overall size of a shape, without changing the angles or relative sizes (ratios) of lines or curves that make up the shape. In other words, dilation resizes a shape so that it still looks like the original, just larger or smaller.
Lesson idea: http://goo.gl/VXHgNH Grade: 68

Lego SymmetryBuild 1/2 a picture out of legos. Then the symmetric have a group complete the picture as they learn about symmetry.
Grade: 35

Strawbees Geodesic DomeUsing Strawbee connectors and straws, build a Geodesic dome Measurements, supplies and instructions provided.
Grades: 68

Lego Math Lesson ideas
Fractions, multiplication, meanmedianmode, place value & spacial Awareness
Grades: K4