Number Worm · NC.K.CC.3
A numeral is a path with a beginning and a direction. So is a worm. That is the whole idea, and the diagnosis falls out of it for nothing.
A dark panel, one number drawn as a line of dots, and a yellow ring with a small arrow showing where the number starts and which way it goes. The child puts a finger on the ring and follows the dots. A bright worm grows behind their finger, eating each dot as it reaches it.
The dots only go in one order. The worm will not eat ahead, and it will not eat backwards. If the finger leaves the line, the board flashes once at the edge and the worm waits where it is — it does not reset, scold, or end the attempt. When the last dot is gone the whole number lights up and the worm has eaten a 6.
Every digit from 0 to 9, each with its own start point, its own direction, and its own number of strokes — a 4 is two strokes and the game knows it, so a child cannot draw one in a single swoop and be told they were right.
Formation is where you start and which way you go, not just the finished shape. A 6 drawn from the bottom up looks like a 6 on the page and will fall apart the moment the child has to write at speed. The game cannot be completed that way, because the dots will not be eaten out of order.
Each number is divided into named parts, and the record notes which part the finger was in when it left the line. That turns a vague worry into a sentence a teacher can act on.
Those are two different problems with two different lessons, and the usual way of noticing them — looking at a page of wobbly sixes — cannot tell them apart.
| Number | Where it usually breaks | What the record says |
|---|---|---|
| 6 | The curve comes down fine and then the loop is guessed at, or joined in the wrong place | turning into the loop, closing the loop |
| 9 | The loop is left open, so the tail starts from thin air | closing the loop, then down the tail |
| 3 | The two bumps run together, or the second is started before the first is finished | the pinch in the middle |
| 5 | Drawn as one continuous curve instead of a top bar and a belly | down the back |
| 8 | Two separate circles rather than one continuous line | the cross in the middle |
| 4 | Made in one stroke, so the vertical never lines up | Second stroke never started |
Three other things are counted, each because it means something different: started in the wrong place (a reversal, not a wobble), lifted a finger mid-number (the motor plan has not joined up yet), and finished versus merely attempted.
A departure is counted once, not once per frame. A child who holds a finger off the line for a second has made one mistake, and the record says one. Counting every sixtieth of a second would turn a single hesitation into thirty failures and make the number useless.
The next number offered is the one the child is worst at, not the next one in the list. When nothing is breaking, it offers whichever they have practised least. It will not give the same number twice in a row.
The strip along the bottom shows all ten at once: green for the ones a child has finished cleanly three times, orange for the ones coming apart, plain for the ones not yet tried. A teacher can also just press the number they want to work on.
Progress earns the same star jar as every other tool in the suite — three numbers written fills one star — so a child moving between the counting tool, the number mat and this one keeps the same jar and the same record.
It is not handwriting on paper. A finger on glass and a pencil in a fist are different motor tasks. This teaches the path and the order, which is the part that transfers; the grip and the pressure do not.
It is not a score. There is no percentage anywhere, and nothing on the glass tells twenty watching children who got it wrong. The read-out sits behind the teacher passcode.
It is not a diagnosis of anything but formation. It says where a line goes wrong. Whether that is a motor issue, a visual one, or simply not having been taught the start point yet is a judgement for the adult who knows the child.
Numeral writing is NC.K.CC.3 — write numbers 0–20 and represent a number of objects with a written numeral. The fine-motor side of it is readiness rather than a maths standard; its nearest home in the North Carolina standards is handwriting, RF.K.2, over in English Language Arts.