# Category Archives: Diagrams and decorations

## Number and numeration gone wrong

This came from a workbook bought by the kids’ grandparents.

Can someone please explain the purpose of the jars of bugs here?

## Diagrams, week 10 (bonus)

A former calculus student who is tutoring in a local elementary school stopped by to ask about how and why decimal points work in the lattice algorithm for multi digit multiplication. Here’s the residue of our conversation.

## Diagrams, week 10

A student submission in response to the question, “Can a hexagon be equiangular, yet have no two sides congruent?” This is presently an A Assignment in my math for elementary teachers course, and is still open (although this diagram purports to resolve it with a counter example).

## Diagrams, week 9

Griffin’s scratch paper. He needed to find 29 divided by 2 on his third grade homework.

## Diagrams, week 8 (late)

A College Algebra student wondered whether there could be a function such that its inverse is the same as its opposite. That is, can there be an f such that $f^{-1}(x)=-f(x)$?

I had to work graphically to think this through, which you see above.

That task is now an A Assignment.