Number Talks: 10 Minutes That Transform Maths Culture

A number talk is a 10-15 minute whole-class routine where students solve a mental maths problem and share their thinking strategies. The teacher writes a problem on the board — say, 27 × 4 — and students solve it mentally, then share different approaches. The teacher records each strategy on the board without evaluating them: "Mia, can you walk us through how you thought about that?"

Number talks build mathematical discourse, mental computation fluency, and confidence. They shift classroom culture from "there's one right method" to "there are many ways to think mathematically." Research from Sherry Parrish's work in the US and its Australian adaptations consistently shows measurable gains in computation and number sense within a single term.

Start simple. For Year 3: try 8 + 7. For Year 6: try 48 × 5. For Year 8: try 15% of 80.

1. Write the problem. Students think silently and show a thumbs up when they have an answer (not their hand up — this gives everyone think time)
2. Once most thumbs are up, ask for answers without judging: "What answers do we have?" Record all of them on the board.
3. Ask students to share strategies: "Who can tell us how they got 56?" Record the strategy visually.
4. Discuss: "Do these strategies give the same answer? Which one would you choose and why?"

The magic is in step 4 — the discussion, not the answer. Encourage students to "agree and add" or "respectfully disagree."

The problem is the lever. Choose problems that invite multiple strategies:

• Primary (doubling/halving): 16 × 5, 24 × 5, 36 × 5 (all invite "double and halve to get to × 10")
• Primary (compensation): 38 + 27, 99 + 47, 198 + 53 (invite "round and compensate")
• Secondary (fractions/percentages): 35% of 60, 12.5% of 96, ¾ of 48

Sequence problems so strategies build. Run the same type of problem for a week before moving on — students' strategies become richer when they see the same structure repeatedly. A student who discovers compensation on Monday will refine it by Friday.

The success of number talks depends entirely on culture. Establish from Day 1: there are no wrong strategies, only strategies we're still developing. Celebrate unconventional approaches. When a student shares a strategy that doesn't work, treat it as gold: "Let's look at why that doesn't give us the same answer — what happened here?" is more powerful than moving on.

Students who "just know" the answer (fast recall) need to be challenged to find another way. "Can you find a different strategy?" pushes fluency further. Students who are slower need protected think time — don't rush to call on the first hands. Number talks are for everyone.