Teaching Routines / Number Groups
Number Groups
Groups of four, numbered one to four. They work out the answer together — and then you call a number, and that person answers for the whole group. Nobody knows who it will be, so everybody has to be ready.
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What is the number groups structure?
Number groups is a cooperative structure in which children work in numbered groups of four, discuss a question until every member could answer it, and then the teacher calls a number. The child holding that number answers on behalf of the whole group.
The mechanism is accountability without exposure. Nobody is singled out for not knowing, because the group had the job of making sure everybody did — but the group cannot succeed by leaving one child out of the conversation.
How do you run it, step by step?
- Group up (about thirty seconds). Fours. Everybody says their number out loud — one to four — so the group knows who is who.
- Discuss (about two minutes). Work out the answer together. Say explicitly that the job is not to get the answer but to make sure all four could give it.
- Reveal (about a minute). Call a number. That child answers for their group. Take two or three groups.
Four minutes. Calling the number after the discussion is what makes it work; announce it first and three children in each group switch off.
How is it different from cold calling?
Cold calling puts one child on the spot with no warning and no help. Number groups puts a child on the spot having had two minutes and three teammates whose job was to prepare them — so the pressure is real but the support was real too.
They pair well. Use number groups when the content is hard enough that a child would need help; use cold calling when it is not.
Two things. First, I call the number and then wait — a good five seconds before anybody speaks — because the moment of “it might be me” is where the accountability actually bites, and rushing past it wastes the structure. Second, and this took me a while: give number four something to do. In almost every group I watched, numbers one and two did the talking and four drifted, on the reasonable basis that the odds were with them. Now the sheet has a line for every child to sign when they could explain it, and I call number four disproportionately often for the first few weeks. The class works this out quickly, which is fine — the point is that they prepare everybody. With Year 3 I use threes rather than fours, because four is one too many to keep involved.
What usually goes wrong?
- The number is announced first, so the other three disengage. Always call it after.
- One number never gets called, and that child works it out. Vary it, and lean on the quieter numbers early.
- The group answers instead of the child. Be firm: the named child speaks, the others have had their turn.
- The question is too easy to need a group at all.
Which year groups is it for?
| Year group | US grade | What to change | How long |
|---|---|---|---|
| Years 2–3 | Grades 1–2 | Groups of three. Let the group whisper a reminder before the answer. | 4 min |
| Years 4–5 | Grades 3–4 | Fours, with everybody signing the sheet when they could explain it. | 5 min |
| Year 6 and up | Grades 5–8 | Ask the named child for the reasoning, not just the answer. | 6 min |
Compared with the other accountability structures
- Cold Calling is the individual version — no group, no preparation, more exposure.
- Envoy also sends one child to speak for a group, but to another table rather than to you.
- Round Robin guarantees a turn rather than making everybody ready for a possible one.
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Written by a practising primary school teacher, and part of the free-to-try Teaching Routines set on Sage Teachers. Last checked August 2026. Everything here is free to try.