Concrete before abstract30–33 months
Number Rods
Ten rods in alternating red and blue segments, so that 'seven' is a thing you can pick up and feel the weight of.
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- Offer it around
- 30–33 months
- Montessori principle
- Concrete before abstract
- What you may see
- Counts with one-to-one correspondence
- Orders quantities from smallest to largest
- Recognises that a longer rod means more
Most early counting teaches a child to recite a sequence of words. Reciting 'one two three four five' is a memory feat, not a mathematical one, and plenty of children can do it fluently without having any idea that five is more than three. The number rods attack this directly by making quantity physical: the rod for seven is longer and heavier than the rod for three, and you can lay one against the other and see the difference.
The alternating red and blue segments are what turn a stick into a number. Each segment is one unit, so the child counts along the rod — one, two, three — touching each coloured band, and reaches the end exactly at the rod's name. The rod is simultaneously a single object and a collection of units, which is a genuinely subtle idea delivered without a word of explanation.
At two and a half the work is ordering the rods into a stair and counting along them. Later the same material carries addition — the four rod and the six rod laid end to end match the ten rod, and the child discovers this rather than being told. Number symbols come after all of this, not before.
What to look for
- Accurate 10cm segment divisions
- Clear red/blue alternation starting with red
- Small (10cm–1m) set for home use
- Solid wood with square section
Not this
Number tiles and worksheets at this age. The symbol should arrive after the quantity is thoroughly familiar.
Safety
The longer rods are heavy — teach two-handed carrying and keep the work on the floor.
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Also for 2–3 years
The rest of this stage
- Care of self and environmentWashing StationA basin, a jug, a brush and a cloth on a tray — the full washing cycle, at a scale a two-year-old can run alone.24–27 months
- Visual discriminationMulti-Shape PuzzleFive geometric shapes on one board — the step up from single shape puzzles, once those have become easy.24–27 months
- Control of errorKnobbed CylindersGraded cylinders that fit one set of sockets and only one — the first of the classic sensorial materials.24–27 months
- Movement as the driver of developmentBalance BikeNo pedals, no stabilisers — feet on the ground, so the child learns balance first and everything else follows.27–30 months
- Care of the environmentChild-Size Garden ToolsA steel-headed spade, rake and hoe with wooden handles, scaled down but not made of plastic.27–30 months
- The complete work cycleTable Washing SetThe classic Montessori table washing work: a defined sequence of a dozen steps, run start to finish by the child.27–30 months
- Isolation of a single qualityPink TowerTen pink cubes from 1cm to 10cm, identical in every way except size. The most recognisable material in Montessori.30–33 months
- Refinement of the visual senseColour TabletsPaired tablets in the three primary colours — the first box, and the beginning of matching by a single quality.30–33 months
- Learning through the sensesSandpaper LettersLetters cut in sandpaper and mounted on boards, traced with two fingers while saying the sound — not the name.33–36 months
- Writing before readingMovable AlphabetLoose letters in a compartmented box, so a child can build words with sounds long before their hand can form them.33–36 months
- Isolation of a single qualityBrown StairTen prisms of identical length that vary only in thickness — the pink tower's companion, isolating breadth instead of size.33–36 months