Linette,

Wonderful to get your message. The fraction charts are introduced at Level C and used in D, and E also.

As far as at what age we introduce the fraction puzzle, it is an add-on item as is the fraction magnet. We use the fraction chart as a required manipulative.

I would say for your situation that you should use the fraction puzzle considering you are using montessori sensorial materials. I love the wooded base with all the puzzle pieces fitting neatly onto the board!

I hope this helps! Please don't hesitate to ask if you have any other questions. :)

Make it a great day!

Cassie ;)