Interleaving: why mixing topics builds deeper understanding
Practising one thing at a time is tidy. Mixing them up is what makes it stick.
The learn-co.de team
12 June 2026
4 min read
Most worksheets are blocked: a page of one type of problem, then a page of the next. It's neat, it's easy to mark, and within the lesson it looks like it's working — by the third question of the same kind, everyone's getting them right.
But getting them right in a block can be a bit of an illusion. Once you know that every question on the page is the same type, you stop deciding which method to use — you just apply the one from the top of the page on autopilot. The hard part of real understanding, knowing which approach a problem calls for, never gets practised.
Interleaving mixes the types up. It feels worse in the moment, accuracy in the lesson dips, and pupils have to keep asking themselves what kind of problem they're even looking at. That extra discrimination is precisely the skill an exam, or a real program, will demand, and it turns out that…
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