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Balancing Act Puzzles

Today I want to highlight a collection of Balancing Act Puzzles from Heather Sparks. Heather is a bit of a legend in the world of Oklahoma math teaching. She was the 2009 Oklahoma Teacher of the Year. If you teach middle school math, her website is worth a browse. I am positive you will find multiple lesson ideas!

Heather has created a free PDF of 20 balance puzzles for teachers to use in their classrooms. These make a great bellwork activity. They are also a great addition to units on equations or systems of equations.

There are five levels of puzzles (levels A – E). The puzzles get progressively harder as the levels progress!

If you like these puzzles, you will also want to check out SolveMe Mobiles for an online interactive version of these puzzles.

Solve Me Mobiles home screen with buttons for play or build.
Collection of 36 SolveMe Mobiles

Rachel

Sunday 12th of September 2021

The key is that the total of all weights is 12. So each of the three spokes/branches has to equal 4. The triangle weighs 4, the circle 2, the square 3, and the flat rectangles are 1 each.

Esther M Ladwig

Tuesday 2nd of November 2021

The problem I see is that there is no statement saying that the 3 arms have to be equal, and one can only assume that the arms of the balance have to be equal. The other problem is that there is no statement saying that the objects have to have unique weights. So, you could have the arms each be 2, 3, or 4. If the arms are 2, the triangle would be 2, then the square and rectangle can both be one. The middle arm would have to be 8 to give a total of 12. This would make the circle 6. If the arms were both 3, the middle arm would be 6. There are actually 2 solutions then. Triangle 3, square 2, rectangles 1, circle 4. OR Triangle 3, square 1, rectangle 2, circle 2. All of this is based on the assumption that the objects cannot have zero as a weight. That opens up several other solutions.

All that being said, I think the assumption is that all the arms are to be equal and that none of the shapes are weightless. BUT that should really be stated explicitly in math problems.

Mike

Sunday 15th of August 2021

What do the center weights tell us in A1? Wouldn't A1 have infinitely many solutions because the center weights do not affect the balance? Am I missing something? Could you email me the solution to the first puzzle so I can understand?

Sarah Carter

Monday 6th of September 2021

I just took a look at A1. I do believe there are multiple solutions. I don't have an answer key since these puzzles are not my own creation.