Double-Frame Flash
Two frames flash. How many dots altogether?
For grown-ups
- How long: 5 to 10 minutes is plenty. Short and frequent beats long and occasional — the early-numeracy trials with the largest effects ran eight weeks or less.
- The strategy to reinforce: “Ten and some more” — Do not count from one. The full frame is ten — start there and count on through the second frame. If they stall, remind them of this rather than giving the answer.
- When they get one wrong: the page shows the working. Read it together rather than moving straight on. Feedback that explains is worth several times more than feedback that only marks right or wrong, and that gap is wider in maths than in any other subject.
- It adjusts as you go: this one gets harder while they are getting them right and easier if they are not, aiming to keep them succeeding about four times in five — hard enough to be worth doing, not hard enough to stop being fun. The score is how deep they got rather than how many they answered, because the difficulty moved. Nothing is stored — it starts fresh every time the page loads.
- On the timer: it is off unless you turn it on, and it is never needed. Use it only once the skill is comfortable, never to introduce it.
- Print it too: doing the same problems on paper a few days later is worth more than doing twice as many today.
What this practises
Seeing a teen number as ten and some more, without counting all of it.
Ten-Frame Flash trains subitizing up to ten; this is the same mechanic aimed at the place-value idea that follows it. The teens are where children who count everything start to fall behind children who see ten as a unit, and the double frame is the standard representation for that step — the first frame fills, so the answer is ten and whatever is in the second. The same caveat applies as at kindergarten: the ten-frame itself has no isolating trial behind it, but the exposure is brief and the quantity is always tied to a numeral, which is the part the evidence supports.
- The underlying idea
- A teen number is one ten and some ones, and the double frame makes that structure visible rather than asserted.
- Where this sits in Illustrative Mathematics
- 1st grade Unit 3: Adding and Subtracting Within 20 · 1st grade Unit 4: Numbers to 99
- Sources
- Clements (1999) · What Works Clearinghouse (2023) · Qiu et al. (2021) · Illustrative Mathematics / Kendall Hunt (2024) all references →
Related measured skills: ALPACA · Early operations, ARF · Addition facts. What this means