(updated - 11/26/12 - math section!)
There is a sub-set of Montessori materials that is utilized at both primary and elementary. The presentations are different; the teaching concepts are different - and the material proves just how deep it can go!
Teacher in one level or the other and want to know which materials overlap levels?
Homeschool parent transitioning from primary Montessori to elementary Montessori?
Curious for another reason as to the depth of the Montessori materials?
Some items can be very useful if you still have them in elementary - the children may do further exploration (pink tower, brown stair and the like come to mind). But core materials?
Keep the following items:
Exercises of Practical Life:
- Primary has care of the environment items on trays on the shelves; elementary has supply shelves, with empty trays to gather what they need. Same items - set up is different
- Many of the EPL supplies can also be used in the geography area in elementary for demonstrations and such.
- Geometry Cabinet (geometry in elementary)
- Constructive Triangles (geometry in elementary)
- Puzzle maps of the world/continents (could be used in elementary, but don't buy them just for elementary)
- Binomial Cube (mathematics in elementary; geometry in adolescence)
- Trinomial Cube (mathematics in elementary; geometry in adolescence)
- Bells (use initially in elementary, then transition to tone bars; but don't buy them if you are just starting elementary - just use the tone bars)
- Other stuff is great to have on hand, but if you must be budget/space-conscious, it is ok to let go ;)
- small movable alphabets (at least 3 colors needed in elementary; letters and punctuation on tiles/cardstock and stored in a divided box - like a tacklebox)
- wooden grammar symbols (multiples of each symbol in a box)
- (NOTE: reading analysis material from primary is organized different, but you could use most of the same components and add the charts - see this post: Reading/Sentence/Logical Analysis)
Language Extensions: (AMI organization; other albums this includes biology)
- Plants and Animals
- (could keep the nomenclature material, but add more components to it - definition strips, more extensive definitions, blank material for the children to create their own)
- Golden beads (9 thousands, 45 hundreds, 45 tens, 45 units is all that is needed for elementary)
- Bead cabinet (all short and long chains, cubes, squares)
- Fraction circles (metal circles)
- Large bead frame (short bead frame is primary; if starting your child in elementary, only use the large bead frame)
- "Decanomial bead bar box" (the set that has 55 of every bead bar, 1-10 - some boxes only have 45, some only have bars 1-9 - these smallers are handy in classrooms; not so useful in homeschools)
- Division with racks and tubes (short division in primary; short and long division in elementary)
- (additional math note: if you purchase the elementary negative snake game, you'll have all you need for the primary level snake games)
(note: this list does not include items that if a child "missed" primary, they might find useful as a bridge into elementary - such as the land/water and continent globes - useful but ok to use an on-the-fly adapted presentations with less expensive and spacious materials)
Let me know if I missed something :)
UPDATED THE MATH SECTION! (decanomial bead bar box --- and short/long division)