What is spaced repetition and does it work for children?

Spaced repetition is the most well-evidenced method for building long-term memory across any subject. For times tables — where retention over months and years is the goal — it's particularly well-suited.

What the research says

Spaced repetition is a scheduling system that revisits each item just before it would be forgotten — so the timing of practice is calibrated to individual memory decay, not a fixed calendar. Mawson and Kang’s 2025 meta-analysis — the most comprehensive recent review — found an effect size of d=0.54 across over 3,000 students in real classroom settings. This is a robust effect, not a laboratory finding.

Rea and Modigliani’s earlier work specifically on times tables found that children using spaced practice retained roughly twice as much as those using massed practice — even with equal total practice time.

What this means in practice

Spaced repetition doesn’t mean practicing less — it means practicing smarter. Facts that are shaky come back sooner; facts that are solid come back later. The result is that practice time is concentrated where it’s needed, not spread equally across what’s already known.

Try this

• Any system that revisits forgotten facts more frequently than learned ones is applying the basic principle. You don’t need software to do this.
• The most common mistake is dropping a fact from practice once it’s learned. Continue to include it at lower frequency to prevent decay.
• If your child seems to have “learned” a fact but then forgets it a week later, that’s a spacing problem — they need more retrieval attempts at shorter intervals before spacing out.

TabTabTab trains recall, not understanding. Building the concept of multiplication — arrays, repeated addition, commutativity — is classroom work, and it comes first.

Last reviewed: 2026-08-01